Question

he wheel of an engine 14.28m in circumference makes four revolutions in 7 seconds. Determine the speed of the train

Answer 1

speed = distance / time

distance travelled is the circumference travelledd that times
means circumference is 14.28 m and made 4 revolutions 
 =  14.28 x 4 = 57.12

and time = 7 sec

so, speed = 57.12/7
                 =8.16

  tehrefore speed of train is 8.16m/s