Multiple choice

Two clocks were set in the morning at 10 a.m. on Sunday. One clock loses 3 minutes in an hour, while the other gains 2 minutes in an hour. By how many minutes do the two clocks differ in the evening at 4 p.m. on the same day?

  1. 25 minutes

  2. 20 minutes

  3. 35 minutes

  4. 30 minutes

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

From 10 a.m. to 4 p.m. is 6 hours. One clock loses 3 min/hr (total loss 18 min), the other gains 2 min/hr (total gain 12 min). The difference is 18 + 12 = 30 minutes.