Question

(SHOW ME A SET-UP ONLY)
Cars A and B are travelling 30 and 40 mph, respectively. If car B starts out 5 miles behind car A, how many hours will it take for car B to overtake car A?

Answer 1

Now let the displacement at which b overtakes a is x
then total disp. for b is x
and a is x-5


now speed of b be v
and a be u

now time should be equal

x-5 x
--- = ---
u v

from here u get x

to get total time calculate x/v .

Answer 2

Thank you (: I forgot the last step where I had to calculate x/v.