Question

a car moves with a speed of 30 km per hour for half an hour 25 km per hour for 1 hour and 40 km per hour for 2 hours find the average speed

Answer 1

30 km/hr for half hour =15 km
25 km/hr for 1 hr = 25 km
40km /hr for 2 hr = 80 km

total distance will be= 15+25+80 = 120 km
total time = 3:30 hr

i.e. avg = 120÷3.5 =34.28 km/hr