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Aptitude Day 254

Problems on Boats and Streams:

1. A man’s speed with the current is 10 km/hr and the speed of the current is 1.5 km/hr. The man’s speed against the current is:

Solution:
                 His rate in still water = 10-1.5 = 12 km/hr.

                 His rate against the current = 8.5 -1.5 = 7 km/hr.

2. A boat can travel at a speed of 7 km/hr in still water. If the speed of the stream is 5 km/hr, find the time taken by the boat to go 96 km downstream.

Solution:
                 Speed of the downstream = 7+5 = 12 km/hr.


                 Time taken for 96 km downstream = 96/12 = 8 hours.

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