A girl goes to school at a speed of 28 km/hr. She comes back with a speed of 21 km/hr. Find her average speed for the whole journey.
- AOption (a)
21 km/h
- BOption (b)
17 km/h
- COption (c)
16 km/h
- DOption (d)
24 km/h
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Correct answer
21 km/h









