Time & Work
Efficiency of A =100/10 = 10%
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Let the total distance be x km then: {([(2/3)x]/4) + ([(1/3)x]/5)} = 1+(1/2) = 3/2, x= 6.43km
New Speed = 4 / 5 of original speed, since the speed and time has inverse relation so, New Time taken by bus = 5 / 4 of the normal time ( 5 / 4 of usual time ) - ( usual time ) = 10 min. 1 / 4 of the normal time = 10 min normal time = 40 min
Let the two trains meets at a distance of x km from delhi. Now [Time taken by train from Lucknow to cover (500-x)km] - [Time taken by train from delhi to cover x km ] = 40 / 60 ((500-x)/70)-x/50 = 40/60, x= 188.9 kms
Time taken to travel 600 kms= 600 / 100 = 6 hrs But it stop after travelling 75 kms , so number of stoping point in 600 kms will be= 600 / 75 = 8, but the last stoping point is actual end stoping so Number of stoping point will be 7, and time taken= 7*3= 21 minutes So total time = 6 hrs 21 mins
Let P be the sum borrowed ((P*5*2)/100)+((P*8*3)/100)+((P*10*3)/100)= 12500, P = 199531.25
Let the Sum is Rs 100, after 8 years it will become 200 So Interest will be = 200 - 100 = 100 , so the rate of interest will be : RI = ((100*SI)/(P*T)) = ((100*100)/(100*8)) = 12.5%
speed of train = [54 * ( 5 / 18 ) ] = 15 m / sec length of train = 120 m , So required time : Time taken = (120/15) = 8 sec.
speed of train = [54 * ( 5 / 18 ) ] = 15 m / sec Distance covered in passing the platform = 100 + 110 = 210 m therefore Time taken = (210/15) = 14 sec.
Relative speed of trains = (50 + 40) km / hr = [90 * ( 5 / 18 ) ] = 25 m / sec Total length to be travelled = 125 + 100 = 225 m therefore Time taken = (225/25) = 9 sec.
Since trains are running in same direction, so relative speed = 100-64 = 36 km / hr = [ 36 * ( 5 / 18 )] = 10 m / sec Total length to be travelled = 110 + 100 = 210 m therefore Time taken = (210/10) = 21 sec.
Let the length of the train is x meter So speed of train =( x / 5 ) m / sec Also speed of train = ( 225 + x ) / 20 m/sec x/5 = (225+x)/20, therfore x = 75 m.
: Let the leak will empty the tank in x hrs. Then part of cistern filled in 1 hr = ( 1 / 8 ) - ( 1 / x ) = x - 8 / 8x So cistern will completly filled in 8x / x - 8 8x/(x-8) = 8+4 =12, x=24 hrs
Part of tank filled by A + B in 1 minute = ( 1 / 15 + 1 / 20 ) So tank filled by A + B in 4 minute = 4 ( 1 / 15 + 1 / 20 ) = 7 / 15 Part remaning = 1 - ( 7 / 15 ) = 8 / 15 1 / 20 part is filled by B in 1 minute So, 8 / 15 part will be filled in = ( 20 / 1 )* ( 8 / 15 ) = 32 / 3 = 10 minutes 40 sec.
Work done by A+B+C in 2 hours = 2 /6 = 1 / 3 So, work remaning = 1- ( 1/ 3 ) = 2 / 3 Now (A + B)'s 7 hour work = 2 / 3 ( A + B )'s 1 hour work will be = 2 / 21 So C's 1 hour work will be = 1 hour work of (A+B+C) - 1 hour work of (A+B) = ( 1/ 6) - ( 2/ 21) = 1 / 14 So C alone can fill the tank in 14 hours
PATANA has 6 letters 1P, 3A, 1T, 1N No of arrangement = 6!/(1! 3! 1! 1!) = 120
Word ENGINEERING has 11 letters, from which EIEEI are vowels, they can e treated as single letter (EIEEI)NGNRNG, So seven letters has 3 N, 2 G , 1 R and single (EIEEI) No of arrangements = 7!/(2! 3!) = 420 arrangement of EIEEI = 5!/(2! 3!) = 10 total number of arrangemnets = 420 * 10 = 4200 (by rule of multiplication)
Here odd and even positions are : C O M P U T E R (O) (E) (O) (E) (O) (E) (O) (E) Now 3 vowels O, U , E In 5 odd place 3 vowels arranged as 5P3 = 5!/2! =60 Also remaning 5 places can be arranged by C, M, P, T, R Remaning 5 consonants arranged as 5P5 = 5! =120 ways So, required number of ways= 120 * 60 = 7200
Required number of ways = 7C5 * 3C2 = 7!/(5! 2!) * 3!/(2! 1!) = 63
As investment period is same so, profit should be divided in ratio of capitals as, 10 : 12 : 15, also 10 + 12 + 15 = 37 A's share = (10/37)*1295 = Rs.350 B's share = (12/37)*1295 = Rs.420 C's share = (15/37)*1295 = Rs.525
Ratio of profits will be 10*6 : 12*8 : 14*10 = 60 : 96 : 140 = 15 : 24 : 35 A's share = (15/74)*666 = Rs.135 B's share = (24/74)*666 = Rs.216 C's share = (35/74)*666 = Rs.315
Ratio of investments =1/2 : 1/3 : 1/4 , now LCM of 2, 3, 4 is 12 on multiplying the ratio with 12 we get 6 : 4 : 3 , also we assume their initial investment be 6x, 2x and 3x so, we can write: A : B :C = (6x*2*3x*10) : (4x*12) : (3x*12) = 42 : 48 : 36 = 7: 8: 6 B's share = (8/21)*378 = Rs.144