Question

Round II (The Knock Out 1)
42. Train A, whose length is 328 m, can cross a 354 m long
platform in 11 s. Train B can cross the same plateform
in 12 s. If the speed of Train B is 7/8 th of the speed of
Train A, then what is the length of Train B?
1. 321 m
2. 303 m
3. 297 m.
4. 273 m
5. 309 m
tho
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Answer 1

Answer:

Length of train B = 297m (option 4)

Step-by-step explanation:

Length of train = 328m

Length of platform = 354m

Total distance covered by train = length of train+ length of platform

Total distance = 328+354

Total distance = 682m

Time taken by train A = 11s

Speed = distance/time

Speed of train A = 682÷11

Speed of train A = 62m/s

Time taken by train B = 12s

Speed of train B = 7/8 of 62m/s

Speed of train B= 7/8 × 62

Speed of train B = 54.25 m/s

Distance covered by train B = Speed×time

Distance covered by train B = 54.25 × 12

distance covered by train B = 651m

Length of train B = Distance covered by train B - Length of the platform

Length of train B = 651 - 354

Length of train B = 297m