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3 years from now will be 360. We would like to find Rouan(iv) A train travels a distance of 480 km at a uniform speeg8 km/h less, then it would have taken 3 hours more to coneed to find the speed of the train.n at a uniform speed. If the speed had beenken 3 hours more to cover the same distance. We |
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Answer» let speed of train= x km/htime= dist/speed = 480/x = 480/x-8A/S480/x-8 - 480/x= 3480(x-x+8/x(x-8)= let speed of train= x km/htime = dist/speed = 480/x = 480/x-8A/S 480/x - 480/x-8=3480(x-x+8)/x(x-8)=3160×8/x^2-8x=1x^2-8x= 1280x^2-8x-1280=0x^2-40x+32x-1280=0x(x-40)+32(x-40)=0(x-40)(x+32)=0either x-40=0, x=40or x+32=0, x= -32(impossible because speed not to be -ve)so speed of train= 40 km/h |
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