Question

Boat ‘A’ can cover 240 km in still water in 12 hours. In still water, if the ratio of the speed of boat ‘A’ to that of ‘B’ is 4:7 and the speed of stream is 2 km/hr then find the time taken by boat ‘B’ to cover the 814 km in downstream.

A 20 hours
B 19 hours
C 21 hours
D 22 hours
E None of these
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