Answer:
60 mph
Explanation:
Let distance travelled by both the cars equal to d.
Also assume speed of Car A as x and speed of Car B as y
Then using distance formula,
d = 2x
Similarly for car B, d = 1.5 y
Also given that
speed of car B = speed of car A +15
y =x+15
Hence we have 2 x = 1.5 y Or x =0.75 y
Substitute in y =x+15 : y =0.75y+15
0.25y = 15
y = 15/0.25 = 60 mph
Speed of car B = 60 mph