Finding the intersection point between two hikers.

Ronald and Rosa are hiking. Ronald hikes 4 miles per hour. Rosa hikes 5 miles per hour. Ronald leaves camp at 8 am for the trail. Rosa leaves camp at 10 am for the trail. At what time will Rosa catch up to Ronald? Where will they be on the trail? How many miles will they be from camp? If they keep hiking for another 2 hours, how far ahead will Rosa be from Ronald?

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...uld be same for Ronald and Rosa.
Let t1= total time for Ronald= (FT- st1)
Let t2= total time for Rosa=(FT-st2)
There fore d = t1 (x) = t2(y)
(FT-st1) (x) = (FT-st2) y
FT(x) - st1(x) = FT(y) - st2(y)
By substituting the values for x ,y,8 and 10 .
4 FT - 8(4) = ...