exam Maths Puzzle Numerical Ability

In a science experiment students study the growth of two different bacteria cultures. One population initially containing 500 bacteria doubles in size every 2 hours, while a second

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The problem is:

Two cars leave town going in the same direction on the same road. One tracels at 30 mph and the other at 46 mph. In how many hours will they be 72 miles apart?

I dont get how to set up the problem. Can someone please help me with these problems. I can not figure out how to do them? Thank you in advance!!

Ariana took 2 h longer to drive 360 mi on the first day of a trip tha