Question

The speed of a boat in calm water is 4 km/hr greater than the speed of the stream. The boat travels a distance of 280 km downstream and 200 km upstream in a total of 70 hours. What is the boat's speed while moving downstream?

A 12 km/hr
B 14 km/hr
C 10 km/hr
D 18 km/hr
E 16 km/hr
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