Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.9 km and 2.1 km respectively. The time taken by the slower train to cross the faster train in seconds is? Choose the correct answer:
A) 99
B) 277
C) 48
D) 96
E) 22
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 = 1.9 + 2.1= 
<gadget id="calculator">1.9 + 2.1</gadget>
<output>4</output>
4 km= 4000 m.   Required time = 4000 * 3/125= 
<gadget id="calculator">4000 * 3/125</gadget>
<output>96</output>
96 sec.   Answer:96
<result>D</result>
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.9 km and 2.1 km respectively. The time taken by the slower train to cross the faster train in seconds is?