You and your sister leave school together to get to your friend’s house which is 16 km
away. Both can walk at a speed of 4 km/h and cycle at a speed of 8 km/h. But you have
only one single-rider cycle. Your sister rides it first and leaves it at a place midway for you
to ride the rest of the way. If you both reach your friend’s house together, how long did
your sister ride the cycle for? Whose average speed was greater? How much time was the
cycle left unused?
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Answer:
Speed=
Time
Distance
⇒Distance=Speed×Time
So, distance to the school =12km/hr×20minutes=12km/hr×
60
20
hour=4 km
So, to cover distance 4km in 15minutes,
Speed=
15min
4km
=
(
60
15
)hour
4km
=16km/hr
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