Question

A car travels 30km at 40km/h and next 30km at 20km/h find avg speed
(10 marks question)​

Answer 1

Use formula 2v1v2/v1+v2

here v1 is 40 and v2 is 20

2 ×40×30/40+30

=240/70 km/he

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Answer 2

Answer:

total time taken =30/40+30/20

=2.25hours

average speed=60/2.25

=26.67km/h

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