Two trains are moving in opposite directions @60kmph and 90kmph. Their length are 1.10km and 0.9km. The time taken by the slower train to cross faster train in second is? Select the correct option
A) 25sec B) 30sec C) 48sec D) 36sec E) 40sec
Relative speed = 60+90= 
<gadget id="calculator">60+90</gadget>
<output>150</output>
150*5/18= 125/3 m/s   Distance covered = 1.10+0.9= 
<gadget id="calculator">1.10+0.9</gadget>
<output>2</output>
2km= 2000m   Required time= 2000*3/125= 
<gadget id="calculator">2000*3/125</gadget>
<output>48</output>
48sec   Answer is 48sec
<result>C</result>
Two trains are moving in opposite directions @60kmph and 90kmph. Their length are 1.10km and 0.9km. The time taken by the slower train to cross faster train in second is?