Suppose the English could drill the Channel in 6.2 years, then they drill with speed 
km per year, where L is the length of the English Channel. If the French could drill in 5.8 years, then their speed of drillling is 
km per year.
Together their speed will be
.
If they drill together, they will spend
years.
Answer: it would have taken nearly 3 years.
1x•4x•5x=180
10x=180
10/10x=180/10
X= 18
Entire distance = 1,320
Entire time = 5 hours
bus avg = 40 km/h
plane avg = 600 km/h
Working this by trial and error
1 hour bus 4 hour plane = 40 + 2,400 = 2,800 distance (too high)
2 hour bus 3 hour plane = 80 + 1,800 = 1,880 distance (too high)
3 hour bus 2 hour plane = 120 + 1,200 = 1,320 distance (Correct!!)
So, they traveled 3 hours by bus and 2 hours by plane
(yes, you had the right answer).
Each cousin will get 0.75 cents because you would have to divide $2.25 by 3. I hope this helps.
