Multiple choice

In an hour a boat goes 18 km. along the stream and 12 km. in still water. What is the speed of boat against the stream?

  1. 6 km./hr.

  2. 8 km./hr.

  3. 12 km./hr.

  4. 4 km./hr.

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

Speed along stream (downstream) = 18 km/hr, speed in still water = 12 km/hr. Stream speed = 18 - 12 = 6 km/hr. Speed against stream = 12 - 6 = 6 km/hr.