travels some distance on straight path with constant speed of 20 kilometre per hour in time interval it travels some distance in the same time interval with constant speed of 30 kilometre per hour find the average speed of the vehicle in kilometre per hour
Answers
Answer:-
Given:
A vehicle travels a certain distance with a speed of 20 km/hr and some distance with a speed of 30 km/hr at the same time.
Let us assume that,
The vehicle takes t hrs to travel with the speeds 20 km/hr and 30 km/hrs.
We know that,
Distance = speed * time.
Hence,
Distance travelled for the first interval = 20 * t = 20t km.
Distance travelled for the second interval = 30 * t = 30t km.
We know,
Average speed = total distance travelled/total Time taken.
- total distance travelled = 20t + 30t = 50t km.
- Total Time taken = t + t = 2t hrs.
Hence,
Average speed of the vehicle = 50t/2t
→ Average speed of the vehicle = 25 km/hr.
Therefore, the average speed of the vehicle is 25 km/hr.
Answer:
let the time be x
so distance will be
1st distance = 20 km/h × x= 20x km
2nd distance = 30km/h× x = 30x km
so average speed will be
= total distance/ total time
= ( 30x + 20x ) / ( x + x )
= 50x / 2x
= 25 km/ph answer
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