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let the speed of car be x
the time needed to cover in speed x is 200/x
if the speed is increased by 10 km/hr
the speed is x+10
the time needed is 200/x+10
therefore 200/x-200/x+10=1
200x+2000-200x/x(x+10)
2000/X2+10x=1
2000=X2+10x
X2+10x-2000=0
complete the equation and solve
the time needed to cover in speed x is 200/x
if the speed is increased by 10 km/hr
the speed is x+10
the time needed is 200/x+10
therefore 200/x-200/x+10=1
200x+2000-200x/x(x+10)
2000/X2+10x=1
2000=X2+10x
X2+10x-2000=0
complete the equation and solve
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