Question

A boat is traveling downstream along a river at a speed of 60 km/h. After covering half the total distance, the speed of the river's current increases by 25%. As a result, the boat reaches its destination 15 minutes earlier than it would have under normal conditions. If the total distance to be covered by the boat is 630 km, determine the original speed of the river current.

A 12 km/h
B 15 km/h
C 18km/h
D 20 km/h
E 10 km/h
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