Let the total work be 1 unit. A’s efficiency = 1/15 (work per day). A and B together = 1/10 (work per day). B's efficiency = (1/10) - (1/15) = (3 - 2)/30 = 1/30 (work per day). Thus, B alone can complete the work in 30 days.
The speed of a boat in still water is 7.5 times the speed of the stream. If the difference between the upstream and downstream speed of the boats is 40 ...
Speed of a boat in still water is 15 km/h while the speed of stream is ____ km/h. Total time taken by the boat to go 150 km upstream and 225 km downstre...
The ratio of the speed of a motorboat to that of a current of water is 36:5. The boat goes along with the current in 5 hours and 10 minutes it will come...
Speed of a boat in still water is 18 km/h while the speed of the stream is ____ km/h. Total time taken by the boat to go 180 km upstream and 270 km down...
The speed of current is 18 km/hr. If the speed of the boat in still water had been 7 km/hr more than the original speed, then it would take 8 hours to c...
If a river is flowing at a rate of 6 km/hr and a boat's speed in still water is 100% higher than the river's speed, and the boat travels 'd' kilometers ...
A boat goes 40 km in upstream in 5 hours and takes 3 hours to complete a distance of 18 km in downstream. Find the speed of boat in still water.
A boat covers 13 km upstream in 52 min. If the speed of the current is 6 km / h, then in how much time will it cover 40 km downstream?
The combined speeds of boats 'P' and 'Q' in still water amount to 52 km/hr. The current's speed affecting boat 'P' is 25% greater than that affecting bo...
A boy can swim in water with a speed of 13 km/hr in still water. If the speed of the stream is 5 km/hr, what will be the time taken by the boy to cover ...
