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A bus travel its onward journey with a c...

A bus travel its onward journey with a constant speed of `30km//hr` and its return journey with a constant speed of `60km//hr`.the average speed for its entire journey is
A. 90 k m / h r
B. 45 k m / h r
C. 40 k m / h r
D. 15 k m / h r

A

90 km/hr

B

45 km/hr

C

40 km/hr

D

15 km/hr

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