A freight train travels at 30 mph. if the freight train is 300 miles ahead of an express train traveling at 55 mph, how long will the express train take to overtake the freight train? 12 hours 360 hours 6.5 hours
6.5 hours
Again, don't trust the robot tutor, it is wrong once again !
let the time taken for the faster train to overtake the slower train be t hrs
distance covered by slow train = 30t
distance covered by the faster train = 55t
55t - 30t = 300
25t = 300
t = 12
in 12 hours the faster train will catch up to the slower train.
check: slow train has gone 300 km + 12(30) km = 660 km
the faster train has gone 12(55) or 660 km