Answer:
Correct option is
A
10 km
Let the distance of his school from the house be x
⇒ The difference in time =(15−5)min
=10min
=
60
10
hr
=
6
1
hr
⇒ Speed during next journey =10+2=12km/hr
According to the question,
⇒
10
x
−
12
x
=
6
1
⇒
5
x
−
6
x
=
3
1
⇒
30
6x−5x
=
3
1
⇒
30
x
=
3
1
⇒ x=
3
30
∴ x=10km
∴ The distance of boy school from house is 10km
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