A girl goes to school at a speed of 21 km/hr. She comes back with a speed of 42 km/hr. Find her average speed for the whole journey.
- AOption (a)
28 km/h
- BOption (b)
26 km/h
- COption (c)
30 km/h
- DOption (d)
20 km/h
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Correct answer
28 km/h



















