Question

find the average speed of an object if it covers 120 km in 45 minutes and another 60 km in 15 minutes​

Answer 1

Explanation:

avg. speed = total distance covered/total time taken

dis.=120km=120×1000=120000m, 60km=60×1000=60000

time=45×60=2700,15×60=900

avg. speed = 120000+60000/2700+900

=180000/3600

so avg. speed = 50m/s