Question

A car moves with a speed of 40 km/h for 15 mintues and then with a speed of 60 km/h for the next 15 minutes. Find the total distance covered by the car in these 30 minutes.​

Answer 1

Answer:

Explanation:

For the first part of journey,

Speed= 40km/h

Time= 15min = 1/4 hour

Using , [ speed=distance/time  ]

Distance= 40 x 1/4=10km

For the second part of journey,

Speed = 60km/h

Time = 15 min = 1/4 hour

Then distance=60 x 1/4=15 km

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

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Answer 2

Answer:

for the first part of journey

Explanation:

speed=40 km/h

time =15 m=1/4 hour.

distance=speed×time=40×1/4=10 km

for the second part of journey

speed=60km/h

time=1/4hour

distance=60/4=15km

15+10=25km