Two trains, each 180 m long,
Two trains, each 180 m long, are moving towards each other on parallel tracks at speeds of 50 km/hr and 70 km/hr. In how many seconds will they completely cross each other?
दो रेलगाड़ियाँ, जिनमें से प्रत्येक 180 m लंबी है, समानांतर पटियों पर 50 km/hr और 70 km/hr की चाल से एक दूसरे की ओर बढ़ रही हैं। कितने सेकंड में वे एक दूसरे को पूरी तरह से पार की जाएँगी?
Detailed Solution & Logic
Correct Answer:
10.8
Total length = 180 + 180 = 360,m
Relative speed = 50 + 70 = 120,km/h
= $\frac{120 \times 1000}{3600} = \frac{100}{3},$ m/s
Time = $ \frac{360}{100/3} $
= $ \frac{1080}{100} $= 10.8,s
Answer: 10.8 s
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