5.
If anshul rows 15 km upstream and 21 km downstream taking 3 hours each time, th’en
the speed of the stream is : . [C.B.I. 1993]
1
km/hr 2 km/hr
1.5
kin/hr 12 km/hr
Answer: 1 km/hr
Explanation: Rate upstream = (15/3) kmph
Rate
downstream (21/3) kmph = 7 kmph.
Speed
of stream (1/2)(7 - 5)kmph = 1 kmph.
