P2 Tutorial 1 Solutions

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Unformatted text preview: +
time
to
bike
to
physics
building

 =

(6mi/12mph)*60min/h
+
10
min
+
5
min
=
45
minutes
 Time
when
driving

 =
time
to
shower
+
time
to
walk
to
car
+
time
on
road
+
time
to
walk
after
parking
 =10
min
+
15
min
+
(6mi/45mph)*60min/h
+
18
min=
51
minutes
 
 3. John
has
two
lawn‐mowing
machines.
The
first
one
can
mow
lawn
twice
as
fast
 as
the
second.
Using
only
the
second
one,
John
can
mow
the
lawn
in
20
minutes.
 How
much
time
can
John
and
his
wife
finish
mowing
the
lawn
if
they
work
 together
using
both
machines?
 
 Solution:
 Suppose
the
area
of
lawn
is
A.
The...
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