Question

a car moves with a speed of 40 km per hour for 15 minutes and then with a speed of 60 km per hour for next 15 minutes find the total distance covered by the car in these 30 minutes

Answer 1

For the first part of journey,

Speed=40km/h and time=15min=1/4 hour

Using ,speed=distance/time

Distance=40 x 1/4=10km

For the second part of journey,

Speed=60km/h and time=15 min=1/4 hour

Then distance=60 x 1/4=15 km

Total distance travelled in whole journey=10+15=25 km

Answer 2

Distance covered with speed 40 km/h = 40*1/4 = 10 km

and, Distance covered with speed of 60 km/h = 60*1/4 = 15 km

Hence, total distance covered = 10 + 15 = 25 km