40.
Speed of a boat in standing water is 10 kmph and the speed of the stream is 2
kmph. A man rows to a place at a distance of 120 km and comes back to the
starting point. The total time taken by him is:
[A]
20
[C]
25
[B]
24
[D]
50
Answer : [C]
Explanation :
|
|
|
Speed
upstream = 8 kmph
|
|
|
|
Speed
downstream = 12 kmph
|
|
|
|
|
|
|
Total
time taken =
|
|
120
|
+
|
120
|
|
hrs
=
|
200
|
=
25 hrs
|
|
|
8
|
12
|
8
|
|
|
