A girl walks to the park, situated 450 m from her house, in 4 min and comes back in 6 min. 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. 5.4 km/h.
Total distance = 2 × 450 = 900 m = 0.9 km
Total time = 4 + 6 = 10 min = 1/6 hours
Average speed = 0.9/(1/6) = 5.4 km/h