e dlld 15CICasCu Uy 07 syual Uts. I'll te Cigul dulu Uldu 01 IC ICClan

1.	e dlld 15CICasCu Uy 07 syual Uts. I'll te Cigul dulu Uldu 01 IC ICClan15. A train covers a distance of 300km at a certain average speed. If its speed were decreased by10km/hr, the journey would take 1 hour longer. What is the average speed of the train?
Answer» distance covered = 300 km let the speed of the train = x km/hr time (t1) = distance/ speed t1 = 300/ x------(1) 2) distance = 300 km speed = (x- 10) km t2 = 300 / (x-10)----(2) given t2-t1 = 1 hr 300/(x-10) - 300/x = 1 [300x - 300(x-10)]/ (x-10)x =1 300x -300x +3000 = (x-10)x 3000 = (x-10) x let x= 60 3000 = (60-10) *60 [true] thereforespeed of the train = x = 60km/hr 60 km/hr is the correct answer .....

e dlld 15CICasCu Uy 07 syual Uts. I'll te Cigul dulu Uldu 01 IC ICClan15. A train covers a distance of 300km at a certain average speed. If its speed were decreased by10km/hr, the journey would take 1 hour longer. What is the average speed of the train?

Answer»

distance covered = 300 km

let the speed of the train = x km/hr

time (t1) = distance/ speed

t1 = 300/ x------(1)

2) distance = 300 km

speed = (x- 10) km

t2 = 300 / (x-10)----(2)

given t2-t1 = 1 hr

300/(x-10) - 300/x = 1

[300x - 300(x-10)]/ (x-10)x =1

300x -300x +3000 = (x-10)x

3000 = (x-10) x

let x= 60

3000 = (60-10) *60 [true]

thereforespeed of the train = x = 60km/hr

60 km/hr is the correct answer .....