Question

The time it takes to cover the distance between two cities by car varies inversely with the speed of the car. The trip takes 7 hours for a car moving at 30 mph How long does the trip take for a car moving at 42 mph?

Answer 1

So instead of varying directly like y = kx, it will vary inversely like y = k/x

Answer 2

Danno do your magic

Answer 3

30 miles per hour, so in 7 hours thats 30*7 = 210 miles travelled in total

42 miles per hour, to travel 210 miles, you see how many 42 miles are in 210, each of them takes one hour
210/42=#hours it takes to travel moving at 42 mph

Answer 4

210/42 = 5,
5 hours

Answer 5

Thank you so much! @518nad