An object covers a certain journey 2500km in the following way (1) first 1000km with speed 80kmp. (2) next 800km with speed of 100kmp. with what speed should he cover the remaining distance so that the average speed for entire journey is 60kmh
Answers
Answer:
A train covers the first 5 km of it's journey at a speed of 30 km/hr and the next 15 km at a speed of 45 km/hr.
We know Average speed = total distance / total time
Time = total distance / speed
Time taken by train in first 5 km journey
Distance = 5 km
Speed = 30 km /hour
Time = 5 km/30km per hour
Time = 0.1667 hour
Time taken by train in next 15 km journey
Distance = 15 km.
Speed = 45 km/hr
Time = 15 km/45 km/hr
Time = 1/3 hour = 0.3333 hour
Average speed = total distance / time
Total distance = 5 km + 15 km.= 20 km.
Total time = 0.1667 hour + 0.3333 hour = 0.5 hour
Average speed= 20 km/0.5 hour
Average speed = 40 km/hour
The average speed of the train is 40 km/hr.
Answer :The average speed of the train is 40 km/hr.
Explanation:
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Answer:
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