Radha walks to her office 5 km away from home. In the morning, she covers the distance in 1 hour whereas, while returning home in the evening, she takes 15 more minutes to cover the same distance. Find her average speed (in km/h) during the two-way journey.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e .
Distance each way:
Home ↔ Office = 5 km
So, total distance (two-way) = 10 km
Time taken
Morning: 5 km in 1 hour → 1 hour
Evening: 5 km in 1 hr 15/60 min = 75/60 hours
Total time = 1 + 75/60 = 135/60 hours
Average speed = Total distance ÷ Total time = 10 ÷ 135/60 ≈ km/h