(iv) A train travels a distance of 480 km at a uniform speed. If the speed had been 8 km/h less, then it would have taken 3 hours more to cover the same distance. We need to find the speed of the train.
Answer:
Let take speed of the train = x km/h
And time taken by train in normal speed = y hours
A train travels a distance of 480 km at a uniform speed.
Distance = speed × time
So we get
x*y = 480 …..(1)
. If the speed had been 8 km/h less, then it would have taken 3 hours more to cover the same distance
New speed = x – 8 km/h
Time taken = y + 3 hours
Use same formula again
Distance = speed × time
or, (x- 8) × (y + 3) = 480
xy + 3x -8y – 24 = 480
plug xy = 480 we get
480 + 3x – 8y – 24 = 480
3x – 8y – 24 = 0
Find the value of y here
-8y = 24 – 3x
Divide by – 8 we get
y = -3 + 3/8x
Plug this value in equation first we get
x(-3 + 3/8x) = 480
-3x + 3/8 x2 = 480
Multiply by 8 we get
-24 x + 3x2 = 3840
Divide by 3 we get
x2– 8x = 1280
x2– 8x - 1280 =0
inidXconszo-1979 Cindy Ross https://marketplace.visualstudio.com/items?itemName=orinsulno.DragonWingsVR-gratuita
ReplyDeletefiltcorsembhluh
AgnosquoMglob_za Mario Cataloni https://www.blissstudioandspa.com/profile/Tecplot360LicenseKeyCrack39-VERIFIED/profile
ReplyDeletemisoftbinsi
provattemp-nu1991 Alexandria Padilla CorelDRAW
ReplyDeleteAvid Pro Tools
CyberLink PowerDVD
tiozatdidif
bofiOin_yu_Fayetteville Jacobi Greene Software
ReplyDeleteClick
arnolegat