ATQ, Let the efficiency of each boy be 'b' units/hour Therefore, total work = 20b X 9 X 12 = '2160b' units Amount of work completed in first 10 days = 20b X 9 X 10 = '1800b' units Remaining task = 2160b - 1800b = '360b' units Since, 5 boys left the task, therefore Time taken by 15 men to complete the remaining work = (360b/15b) = 24 hours
Train ‘A’ running with a speed of 108 km/hr crosses a vertical pole in 8 seconds. Find the time taken by the train ‘A’ to cross a train ‘B’ ...
A train can cross a pole, a bridge of 600 meter long and platform of 480 meter long in 14 seconds, _____ seconds and 30 seconds, respectively.
Th...
Without stopping the speed of the train is 125 kmph, with stopping the speed of the train is 75 kmph.Find the stop time of the train?
Two trains running on parallel track with lengths 140 m and 40 m respectively. When travelling in opposite directions they are observed to pass each oth...
Train ‘A’ running with a speed of 45 km/h crosses a pole in 4 seconds. If the time taken by train ‘A’ to cross train ‘B’ running with a spee...
Train P crosses a 350-meter-long platform in 42 seconds. It can cross a stationary pole in 14 seconds. What is the time taken by ...
Two trains of same length are running in parallel tracks in the same direction with speed 90 km/hr and 120 km/hr respectively. The latter completely cro...
Train X, traveling at a speed of 54 km/hr, crosses another train Y, which is moving in the opposite direction at a speed of 90 km/hr, in 't' seconds. If...
1600 metres long train crosses a man who is moving in the same direction with a certain speed in 25 seconds. If the same train can cross a pole in 20 se...
Train A leaves a station at a certain time and at a fixed speed. After 4 hours, Train B leaves the same station and moves in the same direction at a uni...
