Question

The ratio of the speed of boat in upstream to speed of boat in downstream is 7:9. If the boat can cover a total of 112 km upstream and 153 km downstream in 11 hours, then find the time taken by the boat to cover 180 km in still water.

A 2.5 hours
B 5.5 hours
C 7.5 hours
D 6.5 hours
E None of these
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