Question

an object Travels a distance of 18 m in 4 seconds and then another 18 m in 2 second what is its average speed of object​

Answer 1

Refer the image attached.
Hope you get it.
Thank you.

Answer 2

Speed = distance / time

Speed in first case is

$18 \div 4 = 4.5$

Speed in second case is

$18 \div 2 = 9 \:$

average speed is

$( \: 9 + 4.5 \: ) \div 2$

Therefore, average speed 6.75 m/s