Question

Hina drives first 120 km in 2 hrs and next 180 km in next 4 hrs. What is her

average speed for the entire trip in km per hour?

step by step explanation plz​

Answer 1

The average speed of the entire trip of hina in km/h is 51.42 km/h

Given ,

• Distance travelled in first 2 hrs = 120 km
• Distance travelled in next 4 hrs = 180 km

We need to find

• Average speed

Firstly finding speed

• Speed in first 2 hrs = 120/2 = 60km/h

• Speed in next 4 hrs = 180/4 = 45 km/h

As we know that ,

• Average speed = 2V₁V₂/V₁ + V₂

Substituting known values we have ,

⇒ Average speed = 2 ( 60 ) ( 45 ) / 60 + 45

⇒ Average speed = 2(60)(45)/105

⇒ Average speed = 5400/105

⇒ Average speed = 51.42 km/h