Question

A boat goes downstream for 44 km and immediately return. It took the boat twice as long as to make the return trip. If the speed of river flow were twice as high, the trip would take 660 minutes, find the speed of boat?

A 14.4km/hr.
B 16.8km/hr.
C 12.6km/hr.
D 10.4km/hr.
E 11.6km/hr.
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