A train overtakes two persons walking along a railway track. The first one walks at 4.5 km/hr. The other one walks at 5.4 km/hr. The train needs 8.4 and 8.5 seconds respectively to overtake them. What is the speed of the train if both the persons are walking in the same direction as the train? Choose the correct choice from the following options:
A) 81 B) 66 C) 55 D) 42 E) 30
4.5 km /hr = (4.5*5/18) = 5/4 m/sec = 1.25 m/sec   5.4 km/hr = (5.4*5/18) = 3/2= 
<gadget id="calculator">3/2</gadget>
<output>3/2 = around 1.5</output>
1.5 m/sec   speed= (x-1.25)*8.4=(x-1.5)*8.5   x=22.5   speed = 22.5*18/5= 
<gadget id="calculator">22.5*18/5</gadget>
<output>81</output>
81 km/hr   81NSWER 81
<result>A</result>
A train overtakes two persons walking along a railway track. The first one walks at 4.5 km/hr. The other one walks at 5.4 km/hr. The train needs 8.4 and 8.5 seconds respectively to overtake them. What is the speed of the train if both the persons are walking in the same direction as the train?