Verified Answer :

60 miles in 3.5 hours. we need to divide to find how many miles he went in one hour.

so 60 divided by 3.5 is 17.1428571429

If you round he was going about 17 miles an hour

AL2006

Average speed = (distance)/(time to cover it). ..... (60)/(3.5 hours) = 17.143 per hour. ... (The 17.143 could be nanometers, inches, miles, light years etc. No unit is given in the question.)