Question
Download Solution PDFA train crosses a pole in 5 seconds and crosses the tunnel in 20 seconds. If the speed of the train 90 m/s, then find the length of the tunnel.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Time to cross the pole = 5 sec
Time to crosses the tunnel = 20 sec
Formula used:
Speed = Distance/Time
Calculation:
Let the length of the tunnel be x m and the length of the train be y m
Time = Distance/Speed
⇒ 5 = (y/90)
⇒ y = 450 m
Time to crosses the tunnel = Distance/Speed
⇒ 20 = (y + x)/90
⇒ 20 × 90 = (450 + x)
⇒ x = 1800 - 450 = 1350
∴ The length of the tunnel is 1350 m.
Last updated on Jun 30, 2025
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