Question

A scooter moves at a constant speed of $90 {m} / {sec}$. for 4 seconds and then it again moves with a constant speed of $60 {m} / {sec}$. for 2 second, then calculate its average speed.

Answer 1

Average Speed —

 $=\frac{\text { Total distance }}{\text { Total time }}$

$=\frac{90 \times 4+60 \times 2}{6}=80 {~m} / {sec}$.