Question

A car travels 100 km at a speed of 60 km per hour and retum with a speed of 40 km per hour . Find average speed.​

Answer 1

Answer:

Explanation:

Total distance travelled=100+100=200

Speed=60-40=20

So,Average speed=Distance/Speed

200/20=10km/hr

Hope it helps

Answer 2

Given

A car travels 100 km at a speed of 60 km per hour and retum with a speed of 40 km per hour

To find

Find the average speed

Solution

★A car travels 100 km at a speed of 60 km per hour

• Distance = 100km
• speed = 60km/h
• time = ?

**Let the time be t1**

→ Time = distance/time

→ t1 = 100/60

→ t1 = 5/3hrs

★Then car retum with a speed of 40 km per hour

• Distance = 100km
• speed = 40km/h
• time = ?

**Let the time be t2**

→ Time = distance/time

→ t2 = 100/40

→ t2 = 5/2

Now

(★) Average speed = total distance travelled/total time taken

→ Average speed = 100+100/5/3 + 5/2

→ Average speed = 200/10 + 15/6

→ Average speed = 200/25/6

→ Average speed = 200 × 6/25 = 48km/h