13. A girl walks 12 km at the speed of 3 km/h. What change should she make in her speed to
take (1) an hour less and (ii) an hour more to cover the distance?
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2
Answer:
Speed =3 km / hr
Distance =12Km then,
S= D / T
= 12/3
=4hr
I) time should be less than 1hr
t =3hr
d=12km
s =d/t
=12/3
4km
ii) An Hours more to be covered distance then t=5h
s=d/t
=12/5
=2.4km/hr
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