The train crosses the distance of first 5 km with a speed of 30 km / h and the distance of next 15 km at speed of 45 km / h. The average speed of that train?
Answers
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.
PLZZ mark the brainliest