Question

Mr. Smith drove for 45 minutes at a speed of 40 km/h. He stopped for 15 minutes for a coffee break and then he drove for 2 hours at a speed of 75 km/h. What was his average speed for the entire journey?

Answer 1

Answer: The answer is 65 5/11

Step-by-step explanation: The first portion would be 30km. Second portion not counting coffee stop would be 150km. Since the average speed is distance/Time it would be 180/Time. Time =2 3/4. Answer is 65 5/11. I hope this is correct.