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- A train 800 metres long is running at a speed of 78 km/hr.
Question 1:
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 :
A. 300m
B. 400m
C. 500m
Feedback Given, Length of the train = 800 m
Speed ofthe train = 78 km/hr
= 78 × (5 / 18) m/s
= 390 / 18 m/s
Time to cross the tunnel = 1 min = 60 sec
Formula: Distance = Speed × Time
=> Length of the train + length of the tunnel = Speed of the train × Time to cross the tunnel
=> 800 + length of the tunnel = (390 / 18) × 60
=> 800 + length of the tunnel = 23400 / 18
=> 800 + length of the tunnel = 1300
=> length of the tunnel = 1300 - 800 = 500 m
Speed ofthe train = 78 km/hr
= 78 × (5 / 18) m/s
= 390 / 18 m/s
Time to cross the tunnel = 1 min = 60 sec
Formula: Distance = Speed × Time
=> Length of the train + length of the tunnel = Speed of the train × Time to cross the tunnel
=> 800 + length of the tunnel = (390 / 18) × 60
=> 800 + length of the tunnel = 23400 / 18
=> 800 + length of the tunnel = 1300
=> length of the tunnel = 1300 - 800 = 500 m
D. 540m
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