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Standard VII
Mathematics
Average Speed
a swimming po...
Question
a swimming pooli s 100 m long . A boy can swim across the length of the pool and then return to his position in 8 minutes. What is his speed in km/hour?
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Solution
Dear student,
T
o
t
a
l
d
i
s
tan
c
e
=
100
+
100
=
200
m
T
i
m
e
=
8
m
i
n
S
p
e
e
d
=
D
i
s
tan
c
e
T
i
m
e
S
p
e
e
d
=
200
8
S
p
e
e
d
=
25
m
/
m
i
n
S
p
e
e
d
=
(
25
×
60
)
1000
k
m
/
h
r
S
p
e
e
d
=
60
40
k
m
/
h
r
S
p
e
e
d
=
1
.
5
k
m
/
h
r
T
h
u
s
h
i
s
s
p
e
e
d
i
n
k
m
/
h
r
i
s
1
.
5
Regards
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