Question

How 2-5 A car careers a distance of 800 De kom in howrs much dcime will it take to cover a distance of 1000 km? Assume that the speed of a car is uniform​

Answer 1

Step-by-step explanation:

Solution

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Correct option is A)

Uniform speed =x km/h

distance =240 km

time =

Speed

Distance

=

x

240

hours

Due to heavy rain speed =(x−10) km/h

Now time =

x−10

240

hours

According to question

x−10

240

−

x

240

=2

x(x−10)

240x−240(x−10)

=2

x

2

−10x

240x−240x+2400

=2

⇒2x

2

−20x−2400=0

⇒x

2

−10x−1200=0

x

2

−40x+30x−1200=0

x(x−40)+30(x−40)=0

⇒(x−40)(x+30)=0

x=40 and x=−30 (speed can not be negative)

∴ uniform speed =40 km/h