Speed Time And Distance

We are given that the train passes a telegraph post in 40 seconds and moves at a rate of 36 km/h. First, we convert the speed to meters per second: The distance traveled by the train in 40 seconds is: Thus, the length of the train is 400 meters.

The earth completes a full rotation, or , in 24 hours. To find the angle turned in 3 hours 20 minutes, we first convert 3 hours 20 minutes to a fraction of 24 hours: Now, the angle turned in hours is: Therefore, the correct answer is .