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Question: Answered & Verified by Expert
A $150 \mathrm{~m}$ long train is moving with a uniform velocity of $45 \mathrm{~km} / \mathrm{h}$. The time taken by the train to cross a bridge of length 850 meters is
PhysicsMotion In One DimensionJEE Main
Options:
  • A 56 sec
  • B 68 sec
  • C 80 sec
  • D 92 sec
Solution:
2372 Upvotes Verified Answer
The correct answer is: 80 sec
Total distance to be covered for crossing the bridge $=$ length of train + length of bridge
$\begin{aligned} & =150 \mathrm{~m}+850 \mathrm{~m}=1000 \mathrm{~m} \\ & \text { Time }=\frac{\text { Distance }}{\text { Velocity }}=\frac{1000}{45 \times \frac{5}{18}}=80 \mathrm{sec}\end{aligned}$

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