Question

Student A, B and C con complete a puzzle in 20 min, 15 min, and 30 min respectively. If all three student work together, how long will it take to complete the puzzle?

Answer 1

~12.6 minutes

Explanation:

The answer to the question is the average of all their times.

Add the numbers together: 20+15+30=65

Divide 65 by 3 to get about 12.6 minutes