Question

a bus travel half of its journey with 20 m per second and the other half of journey with 80 metre per second find average speed during whole journey

Answer 1

Speed 1 = 20 m/s
Speed 2 = 80m/s

Average speed = speed 1 + speed 2
-----------------------------
2
$= \frac{(20 + 80)}{2}$
= 50 m/s

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Answer 2

there you go. the file is attached