Question

3. A car moves with a speed of 80km/hr for 15min and then with a
speed of 60km/hr for next 15min. The total distance covered by
the car is
A) 100km
B) 50km
C) 35km
D) 70km​

Answer 1

A car travels at a speed of 80km/hour for 15 minutes and then at a speed of 40km/hour for the next 15 minutes. What is the average speed of the car?

Answer

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8 Answers



C. S. Sharma, Most Viewed Writer Quora, Distance (Physics and Mathematics)

Answered September 24, 2019

Friends…!

Car travels at a speed of 80km/hour for 15 minutes

We know Distance = speed × time

Distance travelled in 15 minutes or 0.25 hour

Distance = 80 km/h × 0.25 hour = 20 kilometers

and then at a speed of 40km/hour for the next 15 minutes.

Distance travelled in next 15 minutes or 0.25 hour

Distance = 40 km/hour × 0.25 hour

Distance = 10 kilometers

Now average speed of car = total distance travelled / total time

Average speed = (20 km + 10 km)/ (0.25 + 0.25) hours

Average speed = 30/0.50 kilometer/hour

Average speed = 60 kilometers/hour

Answer 2

Answer:

C) 35km

Explanation:

A car moves with a speed of 80 km / hr for 15 min.

So, 80÷4= 20 km / 15 min.

Then the car moves with a speed of 60 km / hr for 15 min.

So, 60÷4= 15 km /15 min.

Therefore, total distance covered by the car = 20 km +15 km = 35 km.

Please mark this answer as brainliest.