ok, you cover 65 miles in 156 minutes
so:
156min/65miles=2.4min/mile
this means you cover 1 mile in 2.4 minutes
to get how many miles you cover in an hour you subtract 2.4 from 60
60/2.4=25
so your speed is 25mph
or you can do it this way:
2h 36min = 2.6h
and than you can calculate speed straight from that, which is
65miles/2.6h=25mph
hope this is understandable
