A boat goes 30 km upstream and 44 km downstream in 10 hours. In 13 hours it can go 40 km upstream
and 55 km downstream. Then what is the speed of the stream?
(a) 3km/hr
(b) 5km/hr
(c) 6km/hr
(d) 7km/hr
and 55 km downstream. Then what is the speed of the stream?
(a) 3km/hr
(b) 5km/hr
(c) 6km/hr
(d) 7km/hr