Let the speed of steamer = x km/hr
Speed of stream = 1 km/hr
Downstream speed = (x + 1) km/hr
Upstream speed = (x – 1) km/hr
Distance = speed × time
⇒ 9 (x + 1)
= 10 (x – 1)9 x + 9
= 10 x – 10x
= 10 + 9 = 19 km/hr
Therefore speed of the steamer is 19 km/hr
Distance travelled = 9(x + 1) = 9 × 20 = 180 km.