Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is :
Choose the correct choice from the following options:
A) 48
B) 52
C) 58
D) 66
E) None
Sol.   Relative sped = (60 + 90) km/hr   = [150 * 5/18] m/sec = [125 / 3] m/sec.   Distance covered = (1.10 + 0.9)= 
<gadget id="calculator">(1.10 + 0.9)</gadget>
<output>2</output>
2 km= 2000 m.   Required time = [2000 * 3/125= 
<gadget id="calculator">2000 * 3/125</gadget>
<output>48</output>
48 sec.   48nswer 48
<result>A</result>
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is :