A clock gains 3 minutes every hour. How many minutes will it gain between 9 a.m. and 2:20 p.m. (correct time) on the same day?

Explanation

1. 01

   9 a.m. to 2:20 p.m. is 5 hours 20 minutes $= 5\frac{1}{3}$ hours.

2. 02

   Gain $= 5\frac{1}{3} \times 3 = 16$ minutes.