JEE Class main Answered
A boy use to walk to school every morning
& it takes him 20 min. One day on his
way, he realise that he had gotten his
H.W notebook at home. He knew that if
he continued walking to school at the
same speed, he would be there 8 min
before the bell. So he went back home for
the notebook & arrive the school 10 min after the bell. If he walked all the way with
his usual speed, then what fraction of the
way to school had he covered till the moment he turned back?
Asked by bhavikaguddu32 | 15 Jul, 2019, 10:07: PM
Expert Answer
Let d is the distance from home to school.
If he walks from home to school in 20 min, his walking speed ( d/20 )
Let x is the distance from home to the turning point on that day he forgotten HW notebook.
on that day he hastravelled a distance (2x+d)
Since normally he reaches 8 min before school bell ringing time, but on that day he reached 10 min after school bell,
then time taken on that day = 20+8+10 = 38 min.
then we have, (2x+d) / (d/20) = 38 ...................(1)
By dividing Numerator and denominator of LHS of eqn.(1) by d, we get, 2(x/d) + 1 = 38/20 = 19/10 ..........(2)
Hence we get the required fraction x/d from eqn.(2) as, (x/d) = 9/20
Answered by Thiyagarajan K | 16 Jul, 2019, 12:50: PM
Application Videos
-
Elastic potential energy_Restoring force and spring con ...
In this video, the restoring force and spring constant is explained. The vi... -
Expression of Elastic potential energy_2
This video describes the potential energy of spring when it is compressed o... -
Potential Energy Curve
This video describes the potential energy curve and ature of forces based o... -
Work done by static friction
This video describes effect of static friction on the work done by the obje... -
Work done in conservative field - 1
The concept of conservative field, types of conservative forces and example...
JEE main - Physics
Asked by arivaryakashyap | 23 Apr, 2024, 10:40: AM
ANSWERED BY EXPERTJEE main - Physics
Asked by ratnadeep.dmr003 | 21 Apr, 2024, 11:06: PM
ANSWERED BY EXPERTJEE main - Physics
Asked by ksahu8511 | 19 Apr, 2024, 11:55: AM
ANSWERED BY EXPERTJEE main - Physics
Asked by mohammedimroz | 13 Apr, 2024, 09:48: PM
ANSWERED BY EXPERTJEE main - Physics
Asked by medhamahesh007 | 02 Apr, 2024, 11:11: AM
ANSWERED BY EXPERTJEE main - Physics
Asked by gundlasumathi93 | 31 Mar, 2024, 02:13: PM
ANSWERED BY EXPERTJEE main - Physics
Asked by chhayasharma9494 | 31 Mar, 2024, 12:47: PM
ANSWERED BY EXPERTJEE main - Physics
Asked by archithateja3 | 30 Mar, 2024, 10:23: PM
ANSWERED BY EXPERTJEE main - Physics
Asked by Machinenineha | 27 Mar, 2024, 05:28: PM
ANSWERED BY EXPERT
