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The back of a 400-meter long train traveling at 60 kilometers per hour exits a tunnel exactly 3 minutes after the nose of the train enters the tunnel. How long is the tunnel?

 May 12, 2021
 #1
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*****

 

 

cool cool cool

.
 May 12, 2021
edited by CPhill  May 12, 2021
 #2
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In 3 minutes the train travels the lenth of the tunnel + 400 m   ( the length of the train)

 

60 km/hr = 1 km/ min

 

1 km/min * 3 min = 3 km         so the tunnel  is 3 km - 400 m =   2.6 km long

 May 12, 2021

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