4) A car travels with speed 30 km h-1 for 30 minute and then with speed 40 km h-1 for one hour. Find the average speed of the car.
Answers
Answer:
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Step-by-step explanation:
Answer:-36.67 km h^{-1}
step by step explanation:-
Given :-
Speed of car for first 30 minutes = 30 km h^{-1}
Speed of car for next 1 hour = 40 km h^{-1}
To find:- Average speed of the car
solution:-
To find the average speed of the car first we will find the total distance travelled by the car
Total distance travelled by the car
First case
Speed = distance / time
distance = speed x time
= 30 x 0.5 ---- (30 min = 0.5 hour)
= 15 km ---- (i)
Second case
speed = 40 km h^{-1}
distance = 40 km x 1
= 40 km ---- (ii)
Adding (i) and (ii)
Total distance = 15 km + 40 km
= 55 km
Now, we will find the total time of travel
Total time of travel = 0.5 hr + 1.0 hr = 1.5 hr
Average speed = total distance travelled/total time taken
= 5.5 km/ 1.5 hr
= 36.67 km h^{-1}
The Average speed of the car is 36.67 km h^{-1}.
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