A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel

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โœช Choose the correct option.

A train, 800 meter long is running with a speed of 78 km/hr. It crosses a tunnel in 1 minute. What is the length of the tunnel ?

A. 650 meter
B. 555 meter
C. 500 meter
D. 458 meter

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