Question 770137
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Walking speed = 6 km/h
Riding speed = 3 times = 18 km/h
Let distance to school be x km
Time taken to walk to school = x/6 hours (because time = distance / speed)
Time taken to ride back = x/18 hours
Total time is given to be 1 hour
So we get the equation
{{{x/6 + x/18 = 1}}}
Simplifying
{{{3*x + x = 18}}}
{{{4*x = 18}}}
{{{x = 4.5}}} km
Distance to school is 4.5 km
Since she walked at 6 kph, how much time did she spend walking? it is
Distance / speed = 4.5/6 = 0.75 hours or 45 minutes.
:)
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