Discussion :: Time and Work
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A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters)is
Answer : Option C
Explanation :
Speed = | ![]() |
78 x | 5 | ![]() |
m/sec | = | ![]() |
65 | ![]() |
m/sec. |
18 | 3 |
Time = 1 minute = 60 seconds.
Let the length of the tunnel be x metres.
Then, | ![]() |
800 + x | ![]() |
= | 65 |
60 | 3 |
" src="/uploads/d_images/m_img_0_1617181673.gif" /> 3(800 + x) = 3900
" src="/uploads/d_images/m_img_0_1617181673.gif" /> x = 500.
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