Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.15 km and 0.6 km respectively. The time taken by the slower train to cross the faster train in seconds is?
Choices
A) 42
B) 9
C) 7
D) 67
E) 15
:   Relative speed = 60 + 90= 
<gadget id="calculator">60 + 90</gadget>
<output>150</output>
150 km/hr.= 150 * 5/18 = 125/3 m/sec.   Distance covered = 1.15 + 0.6= 
<gadget id="calculator">1.15 + 0.6</gadget>
<output>1.75</output>
1.75 km= 1750 m.   Required time = 1750 * 3/125= 
<gadget id="calculator">1750 * 3/125</gadget>
<output>42</output>
42 sec.   42nswer: 42
<result>A</result>
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.15 km and 0.6 km respectively. The time taken by the slower train to cross the faster train in seconds is?