Question

The speed of a boat in downstream is 4 km/h and the speed of the current is 1 km/h. Find the speed of boat in upstream.
1. 3 km/h
2. 4 km/h
3. 2 km/h
4. 5 km/h

Answer 1

Correct Answer - Option 3 : 2 km/h

Given:

Downstream speed = 4 km/h

Speed of current = 1 km/h

Formula used:

Speed of current = (Downstream speed – Upstream speed)/2

Calculation:

1 = (4 – Upstream speed)/2

⇒ Upstream speed = 4 - 2 = 2

⇒ Upstream speed = 2 km/h