A truck travels with a speed of 40 km / h for
30 min then with a speed of 30 km/ h for 1 hour .
calculate total distance travelled and average
speed of the truck.
Answers
Answer:
50km, 33int1/3 km/h
Explanation:
distance covered in 30 minutes by speed 40km/h
= 40×1/2= 20km
distance covered in 1 hour by speed 30 km/h
= 30 km
total distance covered= 20+30=50 km
average speed= total distance/ total time
= 50/( 1+1/2)= 50×2/3= 100/3 km / h
= 33 integer 1/3 km/hour
Given: A truck travels with a speed of 40 km/h for 30 minutes and then with a speed of 30 km/h for 1 hour.
To find: Total distance travelled and average speed of the truck
Solution: Speed of the truck for the first 30 minutes=40 km/h
Time= 30 minutes
= 30/60 hour ( 1 minute= 1/60 hour)
= 0.5 hour
Distance travelled at this speed
= Speed × Time
= 40 × 0.5
= 20 km
Speed of the bus for next 1 hour= 30 km/h
Time= 1 hour
Distance travelled at this speed
= Speed × Time
= 30 × 1
= 30 km
Therefore, total distance travelled
= 20 km + 30 km
= 50 km
Average speed is equal to the total distance travelled by the body by total time taken.
Here, total distance travelled= 50 km
Total time taken = 0.5+1 = 1.5 hours
Therefore, average speed
= Total distance/Total time
= 50/1.5
= 100/3 km/h
Therefore, the total distance travelled is 50 km and average speed of the truck is 100/3 km/h.