Aakriti was sitting inside train A, which was traveling at 58 km/h, another train B whose length was four times the length of A crossed her in opposite direction in 20 seconds. If the speed of train B was 68 km/h, then the length of train A (in meters) is?
Answer & explanation
Correct answer: option 2
Let train A's length = x
Train B's length = 4x
\(\frac{4x}{(58 + 68) × \frac{5}{18}}\) = 20
4x = 20 × 5 × 7 = 700
x = 175 m
[Second train will cross Aakriti, so only second train B's length is considered]