Question

A car travels 40 km in 30 minutes and the next 40 km in 40 minutes. calculate the average speed for the entire journey.

Answer 1

average speed = total distance/total time
average speed = 80km/70 min
= 8/7 km/min ans..

I HOPE THIS IS HELPFUL FOR YOU

Answer 2

✯ 68.67 km/hr ✯

Explanation:

Given:

• Car travels 40 km in 30 minutes
• Next 40 km in 40 minutes.

To Find:

• Average speed of the car

Solution: We know that

★ Average Speed = Total Distance/ Total Time ★

$\small\implies{\sf }$ Total Distance = (40 + 40) km = 80 km

$\small\implies{\sf }$ Total Time = (30 + 40) minutes = 70 minutes

• Here distance is in Km and time is in minutes so we have to change it in Km/hr •

→ 60 minutes = 1 Hour

∴ 30 minutes = 30/60 = 1/2 Hours and

∴ 40 minutes = 40/60 = 2/3 Hours

$\small\implies{\sf }$ Total time taken in hours = 1/2 + 2/3

$\small\implies{\sf }$ 3 + 5/6

$\small\implies{\sf }$ 7/6 Hours

Therefore,Average speed = 80 ÷ 7/6

$\small\implies{\sf }$ 80 x 6/7

$\small\implies{\sf }$ 480/7

$\small\implies{\sf }$ 68.57 km/hr

Hence, Average speed of car during entire journey is 68.67 km/hr