John left his house in Irvine at 8:35 a.m. to drive to a meeting in Los Angeles, 45 miles away. He arrived at the meeting at 9:50 a.m.. At 5:30 p.m. he left the meeting and drove home. He arrived home at 7:18 p.m.ⓐ What was his average speed on the drive from Irvine to Los Angeles? ⓑ What was his average speed on the drive from Los Angeles to Irvine? ⓒ What was the total time he spent driving to and from this meeting

A. The average speed was 36 mph.

B. The average speed on the drive from LA to Irvine was 25mph.

C. The total time he spent driving to and from the meeting was about 3 hours and 5 minutes.

The way I usually solve these problems is by using trial and error. A good way to find out about where your numbers are is by finding the square root of that number. The square root of 306 is about 17.5, so I would start with 16 and 17. 17*16=272, so I would know I had to go higher. I would then try 17*18 which equals 306. Because you need the numbers to be negative, you would make both of those numbers negative. The two integers would then be -17 and -18.