A car travels 30km at a uniform speed of 40km/h and the next 30 km at a uniform speed of 20km/h. find its average speed.

By BYJU'S Exam Prep

Updated on: September 25th, 2023

A car travels 30km at a uniform speed of 40km/h and the next 30 km at a uniform speed of 20km/h. Its average speed is 26.66 km/h. The speed at which an object’s location changes in any direction. The formula of Speed:

s = d/t

Where,

d is the distance traveled in m
s is the speed in m/s
t is the time taken in s

Table of content

1. A car travels 30km at a uniform speed of 40km/h and the next 30 km at a uniform speed of 20km/h. find its average speed.

Speed Measurement

Speedometers are used to measure speed in moving vehicles. Odometers are used to calculate the distance travelled. A graph can be used to calculate the speed as well. The distance-time graph aids in comprehending an object’s speed.

Step 1: It is given that

Speed of the car for first 30km = 40 km/h

Speed of the car for the next 30km = 20 km/h

Step 2: Let us calculate the average speed of the car:

Average speed = Total distance travelled/ Total time taken

Time taken to travel the first 30 Km = 30km/ 40 km/hr = 0.75 hr

Time taken to travel the next 30 Km = 30km/ 20 km/hr = 1.5 hr

Total distance travelled = 30 km + 30 km = 60 km

Total time taken = 0.75 hr + 1.5 hr = 2.25 hr

Thus,

Average speed = 60km/ 2.25 hr = 26.66 km/h

Summary: