Question

A person walks across a 60 m wide room with a constant speed of 2 m/s, and they run back with a constant speed of 6 m/s. What is their average speed for the trip? a. 2 m/s b 3m/s c. 4 m/s d. 5 m/s 2 e 6 m/s

Answer 1

Answer:

Option B is the correct answer.

Explanation:

Total distance traveled = 60 + 60 = 120 m

Time taken to walk across $=\frac{60}{2}=30s$

Time taken to run back $=\frac{60}{6}=10s$

Total time taken = 30 + 10 = 40 s

Average speed = Total distance traveled / Total time taken

Average speed $=\frac{120}{40}=3m/s$

Option B is the correct answer.