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Question
Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is -
36
45
48
49
None of these
ANSWER : 3
Descrption
<p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">Relative speed = (60 + 90) km/hr = 150 km/hr = 150×1000/3600 m/s = 41.67 m/s</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">Total distance = (1.1 + 0.9) km = 2 km = 2000 m</span></p> <p><span style = "box - sizing: border - box; font - size: 18px; color: #212529; font - family: bangla, sans - serif; text - align: justify; background - color: #ffffff;">Time taken to cross each other = 2000/41.67 ≈ <strong>48</strong> seconds</span></p>
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