Question

a car travels 10 km distance with a speed of 60km/h and returns with a speed of 40km/h. calculate its average speed for whole journey

Answer 1

60+40/10=10 hope it helps you

Answer 2

A car travels 60km in 60 minutes
car travel 1km in 60/60 minutes =1minut
so car travel 10km in 10 minutes
car return 40km in 60 minutes
1km=60/40 minutes =6/4 minutes
10km 6/4×10=15 minutes
average speed=all distance/all time
all distance is 10+10=20
all time is 10+15=25 minute
so average speed is
20×1000m/25×60s=20000/1500=13.33m/s