Question 36

A boat covers 72 km downstream in 6 hours and upstream in 9 hours. The speed of the boat is:

Solution

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Let us assume the speed of boat = B km/hr and speed of stream = S km/hr.
Downstream: B+S = 72/6 = 12.
Upstream: B-S = 72/9 = 8.
Adding both equations: 2B = 20
==> B = 10 km/hr.

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