A girl walks to a park situated 350 m from her house. It took her 3 mins to reach the park and 4 mins to return. What is the average speed of the girl (in km/h)?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 6 km/h
Formula used:
Average speed = Total distance/Total time
Calculations:
Total distance = 350 × 2 = 700 m
Total time = 3 + 4 = 7 min (or 420 seconds)
Now, according to the question;
⇒ Average speed = 700/420 × (18/5) {converting into km/h}
⇒ 6 km/h