Multiple choice

A man rows 40 km upstream in 8 hours and a distance of 36 km downstream in 6 hours. The speed of stream is

  1. 0.5 km/hr

  2. 1.5 km/hr

  3. 1 km/hr

  4. 3 km/hr

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Upstream speed = 40/8 = 5 km/hr. Downstream speed = 36/6 = 6 km/hr. Stream speed = (Downstream - Upstream) / 2 = (6 - 5) / 2 = 0.5 km/hr.

AI explanation

The speed of the boat upstream is 40 km / 8 hours = 5 km/hr, and the speed downstream is 36 km / 6 hours = 6 km/hr. The speed of the stream is calculated using the formula 1/2 * (downstream speed - upstream speed). Substituting the values gives 1/2 * (6 - 5) = 0.5 km/hr.