A man travels by a motor boat down a river to his office and back. With the speed of the river unchanged

March 12, 2024

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A man travels by a motor boat down a river to his office and back. With the speed of the river unchanged, if he doubles the speed of his motor boat, then his total travel time gets reduced by 75%. The ratio of the original speed of the motor boat to the speed of the river is:

√6 : √2
√7 : 2
2√5 : 3
3 : 2

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