I couldn't solve this problem.Can anyone help??

A man can cross a 100 meter width river in 4 minutes straightly when there is no current in the river.But when the current is available he can cross it in 5 minutes.What is the speed of the current?

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## Comments

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TopNewestHis velocity is 100 meters in 4 minutes, or 25 meters per minute.

It states that with a river current, he takes 5 minutes to cross. This means he traveled a total of 125 meters

relative to the current.Now suppose that instead of the river having a current and the man traveling in a straight line, the river is still stationary and the man is traveling in a slanted line. We have that the slanted line is 125 meters, the distance from coast to coast is 100 meters; therefore, he traveled \(\sqrt{125^2-100^2}=75\) meters away from the point where he would have landed if he had traveled in a line perpendicular to the river. This 75 meters accounts for the current: the current travels 75 meters in 5 seconds, or \(\boxed{25\text{ meters per second}}\).

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75 meters in five minutes so its 0.25 meters per second.........??

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The last computation is the most awful one, no? "75 minutes in 5

minutes, or15meters per minute" (or 0.25 meters per second).Log in to reply

Thanks

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Its 15m/s.

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