Question

A train travels 400m in 10 seconds.find its speed in metres per second and kilometres per hour.

Answer 1

Distance=400m

time=10s

for 1 second:  400/10

=40m/s

speed in m/s=40m/s

speed in km/h:

40*18/5   =  144km/h

speed in km/h=144km/h

hope it is helpful....

Answer 2

Answer:

$\frac{400}{10} = 40ms$