a man can row 7.5 kmph in still water - Wikitechy https://www.wikitechy.com/interview-questions/tag/a-man-can-row-7-5-kmph-in-still-water/ Interview Questions Mon, 06 Sep 2021 09:16:51 +0000 en-US hourly 1 https://wordpress.org/?v=6.9.4 https://www.wikitechy.com/interview-questions/wp-content/uploads/2025/10/cropped-wikitechy-icon-32x32.png a man can row 7.5 kmph in still water - Wikitechy https://www.wikitechy.com/interview-questions/tag/a-man-can-row-7-5-kmph-in-still-water/ 32 32 A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of the stream ? https://www.wikitechy.com/interview-questions/time-and-distance/a-man-can-row-4-5-km-hr-in-still-water-and-he-finds-that-it-takes-him-twice-as-long-to-row-up-as-to-row-down-the-river-find-the-rate-of-the-stream/ https://www.wikitechy.com/interview-questions/time-and-distance/a-man-can-row-4-5-km-hr-in-still-water-and-he-finds-that-it-takes-him-twice-as-long-to-row-up-as-to-row-down-the-river-find-the-rate-of-the-stream/#respond Tue, 17 Aug 2021 21:27:35 +0000 https://www.wikitechy.com/interview-questions/?p=1965

A man can row 4.5 km/hr in still water and he finds that it takes him twice as long to row up as to row down the river. Find the rate of the stream ?

A. 2 km/hr

B. 2.5 km/hr

C. 1.5 km/hr

D. 1.75 km/hr

Answer : C. 1.5 km/hrs

Explanation :

Let the speed of the current be x km/hr.
Upward speed = (4.5 + x) km/hr
Downward speed = (4.5 − x) km/hr.
Let distance travelled be y, then
y / (4.5 − x) = 2y / (4.5 + x)
x = 1.5 km/hr

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