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- A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current?
Question 1:
A man swims downstream 72 km and upstream 45 km taking 9 hours each time; what is the speed of the current? A. 3 kmph
B. 1.5 kmph
Feedback 72 --- 9 DS = 8
? ---- 1
45 ---- 9 US = 5
? ---- 1 S = ?
S = (8 - 5)/2 = 1.5
? ---- 1
45 ---- 9 US = 5
? ---- 1 S = ?
S = (8 - 5)/2 = 1.5
C. 13 kmph
D. 6.5 kmph
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