Question 1012536
In general, remember rate times time equals distance.
Let us call Tom's rate, r.
Then Mark's rate is r+5.
The time they travel is an hour and twelve minutes...that's an hour and a fifth, or 6/5 hours.
The total distance they cover is 45 km.
Thus we can write
(6/5)r + (6/5)(r+5) = 45
Now solve this...maybe multiply everything by 5 to clear fractions...we get
6r + 6(r+5) = 225
6r + 6r + 30 = 225
12r + 30 = 225
12r = 195
r = 195/12 = 16.25 km/h
r+5 = 21.25 km/h