There is road besides a river Two friends started from a place P moved to a shopping mall situated a...........

Quantitative Aptitude (CPO) Boats and Streams

There is road besides a river. Two friends started from a place P, moved to a shopping mall situated at another place Q and then returned to P again. One of them moves on a cycle at a speed of 12 km/hr, while the other sails on a boat at a speed of 10 km/hr. If the river flows at the speed of 4 km/hr, which of the two friends will return to place P?

Both

Boater

Cyclist

None of these

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Explanation:

The cyclist moves both ways at a speed of 12khr so average speed fo the
cyclist – 12 km/hr
boat sailor moves downstream at 10+4 = 14km/hr and upstream 10-
4 = 6km/hr
Average speed of the boat sailor = 2 x 14 x 6 / 14 +6 = 42/ 5 = 8.4km/hr
The average speed of cyclist is greater .so,cyclist comes first and return to
place P.