A bus moving at a speed of 45 km/hr. overtakes a truck 150 metres ahead going in the same directions in 30 seconds. The speed of the truck is  Choose the correct option.
A) 27km/hr B) 24km/hr C) 25km/hr D) 28km/hr E) None of these
Explanation:   The lag of 150 m has been covered by the bus in 30 seconds.   Therefore, the relative speed of the bus and truck is =(5X18)/5=18km/h   The speed of truck is   45-18= 
<gadget id="calculator">  45-18</gadget>
<output>27</output>
27 Km/hr   27km/hrnswer 27km/hr
<result>A</result>
A bus moving at a speed of 45 km/hr. overtakes a truck 150 metres ahead going in the same directions in 30 seconds. The speed of the truck is