The first train travels at 55 miles / hr the second train leaves 3 hours later at 70 miles hour how many hours would it take for the second train to catch up to the first one?

Answer 1

55x =70(x-3) where x= time 1st train traveled at 55 mph

70x -55x =210

15x = 210

x = 210/15 = 14 -3 = 11 hours for 2nd train to catch up

in 14 hours 1st train goes 14x55 = 770 miles

in 14-3=11 hours 2nd train goes 11x70 = 770 miles