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Answer:
10km per hour is the average speed
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Answer:30 km/ hr or 75/9 m/s
Explanation:average of any quantity is= sum /no of quantities
So, average speed = 1st speed + 2nd speed/ 2
=40+20/2
=60/2
To convert in to m/s
Multiply 30 with 5/18
Because km/hr= 1000m/3600s
= 5/18 m/s
So,
=30x5/18
=75/9 m/s
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