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A boat can travel 88.2 km downstream in ...

A boat can travel 88.2 km downstream in 4 hrs 12 mins. The speed of the stream is 2.5 km/hr. If the speed of stream reduces by 50% then find the distance travelled by boat upstream in 4 hrs?

A

69 km

B

64 km

C

84 km

D

79 km

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