Question

Clare is taking 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

Answer:

16.66 meter/sec

Step-by-step explanation:

total distance covered = length of Polar Express + length of ice bridge= 100m + 400m

total time taken = 30 sec

speed = distance / time

= 500/30= 16.66 m/sec

Answer 2

Answer:given,

Time= 30 s

Actual distance to be covered = (100+400)m

[Since when the end of the train will cross the bridge,the front of the train shall be 100 m ahead of the bridge]

Therefore, speed = dist÷time

=(400÷30)m/s

=40/3 m/s

= 40*18/3*5 km/hr

=48 km/hr (answer)

[Note: 1 m/s = 18/5 km/hr]

Step-by-step explanation: