Danny drove his old car 100 kilometers, from his home to a friend. To prevent the engine from overheating, he stopped his car for 10 minutes every time he complete 40 kilometers of continuous driving. When the car was moving, Danny drove it at an average speed of 60 kilometers per hour. What was Danny's average speed on that trip?
A. 37.5 kilometers per hour
B. 48 kilometers per hour
C. 50 kilometers per hour
D. 75 kilometers per hour
E. 100 kilometers per hour
The OA is C.
I don't have clear this PS question, I think that I can solve it of the following way,
I know that the total distance is 100 kilometers, Danny should stop for 10 minutes every 40 kilometer and his average speed when he's moving is 60 kilometers per hour, then average speed will be,
$$A_{speed}=\frac{Total\ Dist}{Total\ Time}$$
Total time will be,
40 minutes (moving) + 10 minutes (first stop) + 40 minutes (moving) + 10 minutes (second stop) + 20 minutes (rest of distante) = 120 minutes or 2 hours.
$$A_{speed}=\frac{100\ kilometers}{2\ hours}=50\ kilometers\ per\ hour$$
I appreciate if any expert explain it for me. Thank you so much.
A. 37.5 kilometers per hour
B. 48 kilometers per hour
C. 50 kilometers per hour
D. 75 kilometers per hour
E. 100 kilometers per hour
The OA is C.
I don't have clear this PS question, I think that I can solve it of the following way,
I know that the total distance is 100 kilometers, Danny should stop for 10 minutes every 40 kilometer and his average speed when he's moving is 60 kilometers per hour, then average speed will be,
$$A_{speed}=\frac{Total\ Dist}{Total\ Time}$$
Total time will be,
40 minutes (moving) + 10 minutes (first stop) + 40 minutes (moving) + 10 minutes (second stop) + 20 minutes (rest of distante) = 120 minutes or 2 hours.
$$A_{speed}=\frac{100\ kilometers}{2\ hours}=50\ kilometers\ per\ hour$$
I appreciate if any expert explain it for me. Thank you so much.
