1. If Rahul rows 15 km upstream in 3 hours and 21 km downstream in 3 hours, then the speed of the stream is (d)
(a)5 km/hr
(b)4 km/hr
(c)2 km/hr
(d)1 km/hr
2.Find the rate of the stream, if a boat covers 120 km downstream and 40 km upstream in 4 hours. (c)
(a) 15 km/hr
(b) 20 km/hr
(c) 10 km/hr
(d) 25 km/hr
3. A man rows 750 m in 675 seconds against the stream and returns in 7 and half minutes. His rowing speed in still water is (b)
(a)4 kmph
(b)5 kmph
(c)6 kmph
(d)7 kmph
4.A boat runs at 22 km per hour along the stream and 10 km per hour against the stream. Find the ratio of speed of the boat in still water to that of the speed of tht stream. (b)
(a) 2:3
(b) 8:3
(c) 5:3
(d) 7:3
5.A man can row upstream 10 kmph and downstream 20 kmph. Find the man rate in still water and rate of the stream. (c)
(a)0,5
(b)5,5
(c)15,5
(d)10,5
