A 100m long train remaining at a speed of 48km/hr passes a tunnel in 21 sec. lets calculate the length of the tunnel
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Answer: 140 m
Step-by-step explanation:
Speed = distance/time.
distance = time * speed.
speed = 48*1000/60*60= 20/3
distance = (20/3)*21 = 7*20 m = 140 metres.
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