A train 400 m long is running at a speed of 54 km/hr. If it crosses a tunnel in 2 minutes. Then what is the length of tunnel?  Pick.
A) 1200 m B) 1400 m C) 1600 m D) 1800 m E) 2200 m
Speed of train in m/sec = (speed of train in km/hr) x 5/18   ∴ speed of train in m/sec = 54 x 5/18 = 15 m/sec   Time taken to cross the tunnel = 2 minutes = 120 sec   Therefore, Total length covered by train in crossing the tunnel = Speed of train x Time taken to cross the tunnel   = 15 m/sec x 120 sec = 1800 m   Total length covered by train in crossing the tunnel = Length of train + Length of tunnel   Given, Length of train =400m and   Calculated above, Length covered by train in crossing the tunnel = 1800 m   Therefore, Length of tunnel = 1800m- 400m = 1400m   CORRECT ANSWER : Option: 1400 m1800 - 400= 
<gadget id="calculator">1800 - 400</gadget>
<output>1_400</output>
1400m   CORRECT ANSWER : Option: 1400 m
<result>B</result>
A train 400 m long is running at a speed of 54 km/hr. If it crosses a tunnel in 2 minutes. Then what is the length of tunnel?