Question 262104
Let the speed of bus A = x mph
And,the speed of bus B = y mph
Bus A is 150 miles due east of Bus B
Both busses start driving due west at constant speeds at the same time. It takes Bus A 10 hours to overtake Bus B.
So, 10(x-y) = 150                       [ time*speed = distance]
    x-y = 15  ...(1)
Also,if had driven toward one another, they would have met in 2 hours.
            2(x+y) = 150
            x+y = 75   ...(2)
(1)+(2)=>   2x = 90
            x = 45
(2)=>       45+y = 75 
            y = 75-45
            y = 30   
Therefore, the speed of bus A = 45 mph
And,the speed of bus B = 30 mph