Legs of a journey with given distances and speeds: average speed

The same question, asked 2 times: CDS 2 2017*, CDS 2 2018. Every wording below, oldest first.

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Question 1
CDS 2 2017
93 $A man travelled 12 km at a speed of 4 km/hr and further 10 km at a speed of 5 km/hr. What was his average speed ?$
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Question 2
CDS 2 2018
29 $A cyclist covers his first 20 km at an average speed of 40 kmph, another 10 km at an average speed of 10 kmph and the last 30 km at an average speed of 40 kmph. Then the average speed of the entire journey is$
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