Question

The velocity of a boat when moving downstream is 18 km/h greater than the speed of the stream. If it takes the boat 8 hours to travel 192 km downstream, determine the time it will take the boat to cover a distance of 90 km upstream.

A 2.5 hrs
B 6.5 hrs
C 7.5 hrs
D 8.5 hrs
E none of these
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