Q1: A man can row three-quarters of a kilometre against the stream in 11 minutes and down the stream in 7 minutes. The speed (in km/hr) of the man in still water is:
A 2
B 3
C 5
D 4
ANS:D - 5
We can write three-quarters of a kilometre as 750 metres,
and 11 minutes as 675 seconds.
minutes and down the stream in 7
minutes. The speed (in km/hr) of the man in still water is:
m/sec
Rate in still water =