Moderate Time, Speed & Distance Solved QuestionAptitude Discussion

 Q. Jim travels the first 3 hours of his journey at 60 mph speed and the remaining 5 hours at 24 mph speed. What is the average speed of Jim's travel in mph?
 ✖ A. 42 mph ✖ B. 36 mph ✔ C. 37.5 mph ✖ D. 42.5 mph

Solution:
Option(C) is correct

$\text{Average speed}=\dfrac{\text{Total Distance}}{\text{Time}}$

Total distance travelled by Jim = Distance covered in the first 3 hours + Distance covered in the next 5 hours.

Distance covered in the first 3 hours = $3×60=180$ miles
Distance covered in the next 5 hours= $5×24=120$ miles

Therefore, total distance travelled = $180+120=300$ miles.

Total time taken = $3+5=8$ hours.