Question

A car moves with a speed of 30 km/h for half an hour, 25 km/h for one hour and 40 km/h for two hours. Calculate the average speed of the car.

Answer 1

Answer:

Hey mate refer to the attachment.

Answer 2

Answer:

We will use the formula—

Average speed = Total distance travelled ÷ Total time taken.

First, we will find the Total Distance.

Traveling at 30 km/h for 1/2 hours = 15km.

Traveling at 25 km/h for 1 hour = 25 km.

Traveling at 40 km/h for 2 hours = 80km.

Therefore, total distance traveled will be 15 km + 25 km + 80 km = 120 km.

Second, we will find the total time taken.

Total time = (1/2) + 2 +1 hour = 3.5 hours.

Put the above values in the formula, we get,

Av. Speed = 120 km ÷ 3.5 hr = 34.28 km/h (approx.)

Now, we know that 1 km/h = (1/3.6) m/s.

Therefore, 34.28 km/h = 34.28/3.6 m/s = 9.52 metres per second (approx.)

Explanation:

Hope you got the answer. Thanks for asking question.....