A person travels from P to Q at a speed of 40 kmph and retur

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A person travels from P to Q at a speed of 40 kmph and returns to Q by increasing his speed by 50%. What is his average speed for both the trips?

[SBI PO 2017]

A 36 kmph

B 45 kmph

C 48 kmph

D 50 kmph

E None of these