How long does it take to drive 400 miles at 75mph?

Answer 1

It is actually 5 hours 20 minutes of total driving time

NOTE: Don't forget to check your answer ,

for example to check 5 hours 20 minutes,

you check how far one covers, if driving at a constant 75 MPH, that is :

5 hours at 75 MPH:

= 5*75 = 375 miles

plus

20 minutes (which is one third (1/3) of an hour) at 75 MPH:

= (1/3)*75 = 75/3 = 25 miles

Therefore 375 miles and 25 miles for a trip total of 400 miles

and so the answer checks out.