Question

during journey a bus xovers 480 KM IN 6 H 24M FIND ITS AVERAGE SPEED​

Answer 1

Answer:Let the time taken to cover 480 Km be time, t

Then, xt=480,  

∴t=  

x

480

​  

 

And, (x−20)(t+4)=480

(x−20)(  

x

480

​  

+4)=480

(x−20)(480+4x)=480x

480x−9600+4x  

2

−80x=480x

4x  

2

−80x−9600=0

x  

2

−20x−2400=0

x  

2

−60x+40x−2400=0

(x−60)(x+40)=0

x=60,−40

Neglect the negative value,

x=60 km/hr