A car travels 42 km/hr for 1 hour 36 km/hr for 3/4 hour and 40 km/hr for 15 minutes find its average speed for the whole journey?
Answers
Answer:
39.5 is the right answer ✔✔✔✔✔✅✅✅✅✅♥️♥️♥️♥️♥️♦️♦️♦️♦️♦️
The answer is given in the following steps.
Given,
Initial speed of the car: 42km/hr.
The time taken for this first journey: 1 hour.
The speed for the second journey: 36km/hr.
The time taken for the second journey: 3/4hr.
The speed for the third journey: 40km/hr.
The time taken by the car : 15 mins.
converting 15 mins into how much hour?
15÷60
= 1/4 hour
Now,
For calculating the average speed of the car for all the journey it went on:
Avg speed = total speed for all the journey ÷ total time taken by the car.
therefore,
Avg speed = (42 + 36 + 40)/ (1 + 0.75 + 0.25)
since, 3/4 = 0.75 and 1/4 = 0.25.
Avg speed = 118/ 2
= 59 km/hr.
Therefore,
The average speed of the car for the whole journey is 59km/hr.