Q1.A car travels with a speed of 40km/h for 20 hours and them with the 60km/h for 2 hours find the average speed of the car²
Answers
Explanation:
✬ Average Speed = 41.81 km/h ✬
Explanation:
Given:
A car travels 40 km/h for 20 hours.
After that car travels 60 km/h for 2 hours.
To Find:
What is the average speed of car?
Formula to be used:
Distance = Speed \times× Time
Average speed = Total Distance/Total time
Solution: Let distance covered by car be d¹ and d².
[ In first case ]
Time¹ = 20 hours
➟ Distance¹ = 40 km/h \times× 20 hours = 800 km
[ In second case ]
Time² = 2 hours
➟ Distance² = 60 km/h \times× 2 = 120 km
∴ Total distance covered by car = D¹ + D²
➱ (800 + 120) = 920 km
∴ Total time taken by car = t¹ + t²
➱ (20 + 2) = 22 hours
So,
⟹ Average speed = 920/22
⟹ Average speed = 41.81 km/h
Hence, the Average speed of car is 41.81 km/h.
Answer:
speed= 40 km/h
time =20 hrs
distance= speed *time
=40*20
800km
speed=60km/h
time =2hrs
again, distance= speed *time
60*2
120km
total distance= (800+120)km
=920m
total time =(20+2)hrs
=22hrs
average speed = total distance/total time
920/22
=41.81km/h