Multiple choice

A motorboat moving downstream covers a distance of 8 miles in 1 hour. However, to cover the same distance upstream it takes 2 hours. What is the speed of the boat in still water?

  1. 7 miles per hour

  2. 6 miles per hour

  3. 5 miles per hour

  4. 4 miles per hour

  5. 2 miles per hour
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Downstream speed = 8 mph. Upstream speed = 8/2 = 4 mph. Boat speed = (8 + 4) / 2 = 6 mph.

AI explanation

The downstream speed is 8 miles divided by 1 hour, which equals 8 miles per hour. The upstream speed is 8 miles divided by 2 hours, which equals 4 miles per hour. The speed of the boat in still water is the average of the downstream and upstream speeds, calculated as (8 + 4) divided by 2. This gives a speed of 6 miles per hour.

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