please please please............................
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3hour=180 minute
then
train cover 360 km in 180+20=200 minute
so that train cover 1 km in 200÷360
so that train cover 90 km in 200÷360×90=50 min
then
train cover 360 km in 180+20=200 minute
so that train cover 1 km in 200÷360
so that train cover 90 km in 200÷360×90=50 min
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