56. A train P takes 40 s to cross a train 800 m long and having a speed of 30 m/s, in the opposite direc-tion. It takes 120 s to cross another train twice itslength and having the same speed and moving inthe opposite direction to it. Find the length of thetrain P in metres.(a) 600(b) 800(c) 1000(d) 1200

56. A train P takes 40 s to cross a train 800 m long and having a sp

1.	56. A train P takes 40 s to cross a train 800 m long and having a speed of 30 m/s, in the opposite direc-tion. It takes 120 s to cross another train twice itslength and having the same speed and moving inthe opposite direction to it. Find the length of thetrain P in metres.(a) 600(b) 800(c) 1000(d) 1200
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