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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
A boat can travel 80 km downstream in 8 hours, and it can travel the same distance upstream in 10 hours. What is the speed of the boat in still water?
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Train A crosses Train B, which is running in the opposite direction at a speed of 60 km/h, in 18 seconds. The ratio of the lengths of Train A to Train B...
‘A’ and ‘B’ started moving towards each other at same time with a speed of 23 km/hr and 24 km/hr, respectively. If the di...
A man travelled a total distance of 400 km. He travelled first 300 km on car with a speed of 60 km/h and rest of the distance on bike whose speed is 40 ...
