115. Two trains, each being 120 metres long.
are running on parallel tracks in opposite
directions 40 metres/minute and 20
metres/minute respectively. How much
time will they take to cross cach
other?
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Step-by-step explanation:
total speed of trains = 40+20 =60m/s
T = D/T
T= 120/60
=2 minute
trains take 2 minute to cross
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