Question

Question
Two trains A and B are moving in opposite direction
of lengths 200 m and 310 m respectively. A bird is
flying between the trains in direction of Train B
such that passengers in train A calculate speed of
bird as 4 m/s and passengers of train B calculates
its speedd a 7 m/s. If bird crosses train A in 50
seconds then find time taken by train A to cross
train in seconds?​

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