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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

A. 90 `km//hr`

B

B. 45 `km//hr`

C

C. 40 `km//hr`

D

D. 15 `km//hr`

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