77.Speed
of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph.
A man rows to a place at a distance of 105 km and comes back to the starting
point. The total time taken by him is:
A. 16 hours B. 18 hours
C. 20 hours D. 24 hours
Answer: Option D
Explanation:
Speed
upstream = 7.5 kmph.
Speed
downstream = 10.5 kmph.
|
Total
time taken =
|
|
105
|
+
|
105
|
hours
= 24 hours.
|
|
7.5
|
10.5
|
