Question

A bus travels with a distance 120 km with a speed of 40 km/h and returns with a speed of 30 km/h. Find the average speed for the entire journey. ​

Answer 1

Given :

• A bus travels a distance of 12 km with a speed of 40 km/h any returns with speed of 30 km/h

To Find :

• Average speed of the entire journey.

Solution :

Here we will simply use the formula for calculating the average of any thing. And let,

• Speed when object is going (v1) = 40 km/h
• Speed when object is returning (v2) = 30 km/h

So,

⇒Average = Sum of Observation/Total No. of observation

⇒Average = (v1 + v2)/2

⇒Average = (30 + 40)/2

⇒Average = (70)/2

⇒Average = 35

$\therefore$ Average speed of entire journey of bus is 35 km/h

________________________________

Speed :

• SI unit is m/s

• It is a scalar quantity

• Speed = Distance/Time

• Speed is defined as rate of change of distance

Answer 2

Given :

• A bus travels with a distance 120 km with a speed of 40 km/h and returns with a speed of 30 km/h.

To Find :

We have to find the average speed for the entire journey.

Explanation :

We know the formula to calculate average.

⇒Average Speed = Total Speed/No. of intervals

→ Average Speed = 40 + 30/2

→ Average Speed = 70/2

→ Average Speed = 35 km/h

∴ The average speed of the bus is 35 km/h.

$\rule{200}{2}$