The drive from Oakland to Pinewood was a tricky one . I covered the uphill…
2024
The drive from Oakland to Pinewood was a tricky one . I covered the uphill distance of 70 miles at 28 miles per hour . The return journey from Pinewood to Oakland was downhill , and I managed to drive at 70 miles per hour . What was my average speed for the entire journey ?
- A.
40 miles/hr
- B.
62 miles/hr
- C.
54 miles/hr
- D.
60 miles/hr
Attempted by 27 students.
Show answer & explanation
Correct answer: A
Solution
Distance (one way) = 70 miles
Total distance = 140 miles
⏱️ Time taken
Uphill:
Time= 70/28 =2.5 hour
Downhill:
Time= 70/70 =1 hour
Total time:
2.5 + 1 = 3.5 hour
Average speed = Total Distance / Total Time = 140 /3.5 = 40