Question:
A train 600 meters long is running at a speed of 90 km/hr. If it crosses a tunnel in one minute, then the length of the tunnel is:
A train 600 meters long is running at a speed of 90 km/hr. If it crosses a tunnel in one minute, then the length of the tunnel is:
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When crossing a tunnel, add the train length to the tunnel length to get total distance covered.
Updated On: Aug 13, 2025
- 500 meters
- 550 meters
- 600 meters
- 900 meters
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The Correct Option is D
Solution and Explanation
Step 1: Convert speed to m/s:
$90 \text{ km/hr} = \dfrac{90 \times 1000}{3600} = 25$ m/s.
Step 2: In one minute (60 s), the train covers:
$25 \times 60 = 1500$ meters.
Step 3: Distance covered = length of train + length of tunnel:
$1500 = 600 + \text{tunnel length}$
$\text{Tunnel length} = 1500 - 600 = 900$ meters.
$90 \text{ km/hr} = \dfrac{90 \times 1000}{3600} = 25$ m/s.
Step 2: In one minute (60 s), the train covers:
$25 \times 60 = 1500$ meters.
Step 3: Distance covered = length of train + length of tunnel:
$1500 = 600 + \text{tunnel length}$
$\text{Tunnel length} = 1500 - 600 = 900$ meters.
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