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- A man takes 20 minutes to row 12 km upstream which is a third more than the time he takes on his way downstream.
Question 1:
A man takes 20 minutes to row 12 km upstream which is a third more than the time he takes on his way downstream. What is his speed in still water? A. 41 km/hr
B. 36 km/hr
C. 42 km/hr
Feedback Let the speed in still water = x km/hr. Takes 20 min. to row 12 km upstream ? speed of u/s = 36 km/hr. Also, time taken for us is 1/3 more than for ds.
distance covered in ds will be 1/3 more.
Hence distance covered by man for ds in 20 min. = 12 × (12/3) = 16km.
So speed of ds = 48 km/hr.
x + y = 48 and x – y = 36 ? x = 42 km/hr.
distance covered in ds will be 1/3 more.
Hence distance covered by man for ds in 20 min. = 12 × (12/3) = 16km.
So speed of ds = 48 km/hr.
x + y = 48 and x – y = 36 ? x = 42 km/hr.
D. 45 km/hr
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