Question

question 4 of 10
a train moves east with a speed of 45 m/s. a man on the train walks west with a speed of 0.4 m/s relative to the train. how long does it take the man to move 10 m relative to the train?
a. 25 s
b. 12 s
c. 0.22 s
d. 32 s

Explanation:

Step1: Identify relevant formula

We use the formula $t=\frac{d}{v}$, where $t$ is time, $d$ is distance and $v$ is speed.

Step2: Substitute values

The man's speed relative to the train $v = 0.4$ m/s and the distance he moves relative to the train $d=10$ m. Substituting into the formula gives $t=\frac{10}{0.4}$.

Step3: Calculate the result

$t=\frac{10}{0.4}=25$ s.

Answer:

A. 25 s