Question

jess is runing around in a circular track, one lap every 40 seconds. cameron is also running at a constant speed around the same track but in the opposite direction. they meeet every 15 seconds. how many seconds does it take cameron to do one lap

Answer 1

It takes 24 seconds for Cameron to make a lap

Explanation:

They meet every 15 seconds. SInce they go in opposite direction, they combined distances during 15 seconds are equal to a whole lap length. In 40 seconds Jess does one lap, so for a rule of 3, we have that in 15 seconds she does

40s ⇒ 100%

15s ⇒ Y

Y = 15/40*100 = 37.5% of a lap

This means that 62.5% is made by Cameron in those 5 seconds. Again, for a rule of three, a 100% would be made in

15s ⇒ 62.5%

x ⇒ 100%

x = 15*100/62.5 = 24 seconds.

So it takes 24 seconds for Cameron to do a lap.