Question

A motor boat goes downstream in a river and covers the distance between two coastal towns A,B in 5 hours.It covers this distance upstream in 6 hours.If the speed of the stream is 2km\hr and the speed of the boat still in water is 22km\hr.

1.The speed of the boat in downstream is _
a)24 Km/hr b)20 Km/hr c) 22 Km/hr d)18 Km/hr

2.The speed of the boat in upstream is _
a)17 Km/hr b)19 Km/hr
c)20 Km/hr d)22 Km/hr

3.The time taken for the boat to travel from town `B` to town` A` is_
a)5 hr b)6 hr c)4 hr d)3 hr​

Answer 1

Answer:

1. Downstream Speed = 24km/hr | (a)
2. Upstream Speed = 20km/hr | (c)
3. Time taken for the boat to travel from B to A = 6hrs | (b)

Step-by-step explanation:

Speed of the stream = 2 km\hr

Speed of the boat still in water = 22km\hr

Downstream  Speed = Speed of the boat still in water +  Speed of the stream

⇒ 22km\hr +2 km\hr = 24km\hr

Upstream  Speed = Speed of the boat still in water -  Speed of the stream

⇒ 22km\hr - 2 km\hr = 20km\hr

The time taken for the boat to travel from town B to town A = Time taken upstream = 6hrs