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CGP EDU Academic Team
Published on: September 13, 2026
Two trains along the same straight rails moving with constant speed 60 km/hr and 30 km/hr respectively towards each other. If at time t = 0 , the distance between them is 90 km, the time when they collide is
Text Solution
Verified by ExpertsThe correct answer is:
A
The relative velocity \(v_{\mathrm{rel}} = 60 - (-30) = 90 \frac{\mathrm{km}}{\mathrm{hr}}.\)
Distance between the train \(s_{rel.} = 90 \text{ km},\)
\(\cdot\) Time when they collide \(= \frac{s_{\mathrm{rel.}}}{v_{\mathrm{rel.}}} = \frac{90}{90} = 1 \mathrm{hr.}\)
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