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

Option B is the correct answer.

Step-by-step explanation:

Total distance traveled = 60 + 60 = 120 m

Time taken to walk across
`=(60)/(2)=30s`

Time taken to run back
`=(60)/(6)=10s`

Total time taken = 30 + 10 = 40 s

Average speed = Total distance traveled / Total time taken

Average speed
`=(120)/(40)=3m/s`

Option B is the correct answer.