Question

Two boys who live 14 miles apart start at noon to walk toward each other at rates of 3 mph and 4 mph respectively. In how many hours will they meet?
a. 1 hr
b. 2hr
c. 3hr

Answer 1

Applying relative motion.

Relative speed of A w.r.t. B= 4+3=7

Time=Distance/speed

= 14/7=2 hours

Answer 2

for one he total distance walked by both is 3+4 =7

therefore for 2hrs 14 miles

b) 2hrs