A boy walks 15 m in 7 seconds and then walks back in 5 secon

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M: +1.00/-0.25

A boy walks 15 m in 7 seconds and then walks back in 5 seconds. His average speed (in m/s) is:

[SSC CPO 16th-March-2019-Shift-2]

A 6

B 2.5

C 3.25

D 4