What if T=400 miles/70 miles per hour what will be my time be

70 miles = 1 hour

Divide by 70 through to get 1 mile ...

(70 : 70) miles = (1 : 70) hour

1 mile = 1/70 hour

Multiply by 400 through to get 400 miles

1 x 400 miles = 1/70 x 400 hours

400 miles = 5 5/7 hours