Question

Clare is taking the Polar Express ALL the way to the North Pole! The Polar Express is 100 meters long and it takes 30 seconds to cross Santa’s 400m ice bridge. What speed is the train going at?

Answer 1

120 seconds take the train cross ice bridge

Answer 2

Answer:

60 km/hr.

Step-by-step explanation:

The polar express is 100 meters long.

And the length of the Santa's ice bridge = 400 meters.

Now, crossing the bridge means crossing a distance equal to the length of the bridge along with the length of the train itself.

Thus, in 30 seconds(given) the Polar Express crosses a distance of (100 + 400) meters = 500 meters.

Thus the speed of the train = 500/30 meters/second = 1000/60 meters/second = 1000 meters/minute = 1 km/minute = 60 km/hr.