Question

The speed of current is 12 km/hr. If the speed of the boat in still water had been 15 km/hr more than the original speed, then it would take 9 hours to cover 567 km in downstream. Find the original speed of the boat in still water (in km/hr).

A 45 km/hr
B 36 km/hr
C 30 km/hr
D 20 km/hr
E None of these
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