Two trains of length 210 m and 440 m are moving in…
Two trains of length 210 m and 440 m are moving in the same direction at speeds of 60 km/h and 90 km/h respectively. How much time (in minutes) will be taken by the faster train coming from behind to completely cross the other train?
210 मीटर तथा 440 मीटर लंबी दो ट्रेनें एक ही दिशा में क्रमशः 60 किमी/घंटा और 90 किमी/घंटा की गति से चल रही हैं। पीछे से आने वाली तेज़ ट्रेन दूसरी ट्रेन को पूरी तरह पार करने में कितना समय (मिनट में) लेगी?
Detailed Solution & Logic
1.3
Relative speed
$=90-60=30\text{ km/h}$
$30\text{ km/h}=\frac{25}{3}\text{ m/s}$
Total distance to be covered
$=210+440=650\text{ m}$
Time
$=\frac{650}{25/3}=78\text{ s}$
$= \frac{78}{60}=1.3\text{ minutes}$
Hence, the correct answer is **1.3 minutes**.
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