The wheel of an engine 30/7 metres in circumference makes seven revolutions in 4seconds. Find the speed of the train in km per hour?
Choose the correct choice from the following answers.
A) 15km/hr  B) 25km/hr  C) 32km/hr  D) 18km/hr  E) 27km/hr
Distance travelled by the train in 4 seconds = 30*7/7= 
<gadget id="calculator">30*7/7</gadget>
<output>30</output>
30 metres   speed of the train= 30/4 = 15/2 m/s = 27 km/hr   Answer is 27km/hr
<result>E</result>
The wheel of an engine 30/7 metres in circumference makes seven revolutions in 4seconds. Find the speed of the train in km per hour?