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Question

There is a boat with speed 17 kmhr. The stream has a speed of x kmhr. What are the upstream and downstream speeds respectively?


A

17-x, 17+x

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B

17+x, 17-x

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C

17-(1/x), 17+(1/x)

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D

17+(1/x), 17-(1/x)

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Solution

The correct option is A

17-x, 17+x


When a boat goes with the stream (downstream) the stream and boat speeds, add up because stream helps boat move faster.

Hence, downstream speed = 17 + x

When the boat goes against the stream (upstream), the stream slows boat down. Hence, the stream reduces boat’s speed.

Hence upstream speed = 17-x


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