Question

At 9:00 am two cars started from the same town and traveled north on the same road. one ca traveled at a rate of 35 mph and the other at a rate of 40 mph. after how many hours will the cars be 30 miles apart

Answer 1

35 x 6 = 210 
40 x 6 = 240 

240 - 210 = 30 

so after 6 hours the cars will be 30 miles apart