Ek railgadi Ek Saman chaal se 360 kilometre ki Duri Tay Karti Hai yadi chaal 5 kilometre Prati Ghanta Adhik hoti hai to see Yatra mein ek ghanta kam Samay Leti Hai railgadi ki Chaal gyat kare
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Answered by
3
(360/x)-(360/(x+5))=1
(360(x+5)-360x)/x(x+5)=1
360x+1800-360x=x (x+5)
x(x+5)=1800
x(x+5)-1800=0
x=40kmph
Answered by
407
Solution :-
Given : Distance = 360 km
Let the speed of train be x km/hr
Time = 360/x hours
According to the question,
=> (x + 5) (360/x - 1) = 360
=> (x + 5) {(360 - x)/x} = 360
=> (x + 5) (360 - x) = 360x
=> 360x - x² + 1800 - 5x = 360x
=> x² + 5x - 1800 = 0
=> x² + 45x - 40x - 1800 = 0
=> x(x + 45) - 40(x + 45) = 0
=> (x - 40) (x + 45) = 0
=> x = 40 or x = - 45
∴ x = 40 (Because speed is taken positive)
Hence,
Speed of train = 40 km/hr
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