Question

The speed of boat 'Y' in still water is the same as the downstream speed of boat 'X'. Boat 'X' requires 1 hour longer than boat 'Y' to travel 80 km downstream. If the speed of the current is 4 km/hr, what is the speed of boat 'Y' in still water?

A 26 km/hr
B 16 km/hr
C 36 km/hr
D 40 km/hr
E None of these
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