School Days

Algebra Level 3

👧🏠 🔜🏢 Sara used to walk to school every morning, and it takes 20 minutes to reach there. Once on her way she realized that she had forgotten her activity at home. She knew that if she continued walking, she would be there 8 minutes before the bell, so she went home back for taking the activity and arrived school 10 minutes late. If she walked all the way her normal speed, what fraction of the way to school she had covered when at that moment when she turned back?

This is a problem of my set " enhance your thinking! " See those questions too!

9/20 11/20 2/5 3/5

1 solution

Sara Sharma
Jun 23, 2014

Normal time taken to reach to school = 20 minutes margin = 8 minutes total time = 28 minutes She got 10 minutes late therefore total time used = 38 minutes let us that the distance when she realised that she forgot her activity is d, then, She covered 2d in 18 minutes as 38 - 20 minutes= 18 minutes therfore d = 9 So 9/20 is the right answer

Did not understand sara daisy here

Savya Atrey - 6 years, 11 months ago

But this is a 7th standard question right? Not a 6th standard right?

Savya Atrey - 6 years, 11 months ago

It's not anything related to 6th or 7th standard. It's just a question to enhance thinking of a any person

sara sharma - 6 years, 11 months ago

i will understand the question and ask my friends to solve it to im sure they will not be able to answer

Savya Atrey - 6 years, 11 months ago

ok ok sara

Savya Atrey - 6 years, 11 months ago

READ YR SOLUTION , LET ME TELL YOU WHY THE PROBLEM SOLUTIONS AS WELL AS YOUR ENHANCED THINKING REQUIRES A MAJOR ENHANCEMENT! 1. SARA DOES NOT WALKS 2D U NITWIT SHE WALKS 9/20 D (AS PER SARA'S DEHENHANCED PROBLEM, SHE TURNS BACK FROM 9D/20 THEREFORE TO GET BACK TO SCHOOL WITH HER PROJECT SHE NOW COVERS 9D/20+D=29D/20 AND NOT 2D, THE ONLY WAY THIS 9D/20 COMES CORRECT IS BECAUSE IT IS CLOSEST TO TIME TAKEN (29 MINS GOING BY 29D/30) ,30 MINS IE THE CORRECT TIME WHEN SCHOOL BELL RINGS AND 10 MINS LATE TIME TO COVER THE EXTRA DISTANCE OF 9D/20.
2. IF YOU CALCULATE THE TIME TAKEN WHICH IS HER NORMAL SPEED(AS PER THE "DE-ENHANCED PROB"IF SHE WALKED HER NORMAL SPEED) IE 20 MINS"SPEED" ONLY IF ITS 10/20 WILL THE ANSWER COME CORRECT AND FIT THE 30 MINS, 3. THIS IS HOW: 10/20 (ANSWER OPTION) , SO 10D/20+D= 30D/20, SINCE IT TAKES 20 MINS TO COVER D, 30D/20 WOULD TAKE EXACTLY 30 MINS AND THAT MATCHES WITH 20 MINS RIGHT TIME +10 LATE =30 MINS TO COVER 30D/20. 4. SO 9D/20 IS THE APPROX ANSWER THE CORRECT ANSWER AND OPTION IS 10/20 NOT 9/20

samraj n - 6 years, 6 months ago

"ENHANCED GUIDE TO DE ENHANCED THINKING PROB AND FLUKE DE-ENHANCED SOLUTION(SUPPOSED TO BE CORRECT"

READ YR SOLUTION , LET ME TELL YOU WHY THE PROBLEM SOLUTIONS AS WELL AS YOUR ENHANCED THINKING REQUIRES A MAJOR ENHANCEMENT! 1. SARA DOES NOT WALKS 2D U NITWIT SHE WALKS 9/20 D (AS PER SARA'S DEHENHANCED PROBLEM, SHE TURNS BACK FROM 9D/20 THEREFORE TO GET BACK TO SCHOOL WITH HER PROJECT SHE NOW COVERS 9D/20+D=29D/20 AND NOT 2D, THE ONLY WAY THIS 9D/20 COMES CORRECT IS BECAUSE IT IS CLOSEST TO TIME TAKEN (29 MINS GOING BY 29D/30) ,30 MINS IE THE CORRECT TIME WHEN SCHOOL BELL RINGS AND 10 MINS LATE TIME TO COVER THE EXTRA DISTANCE OF 9D/20. 2. IF YOU CALCULATE THE TIME TAKEN WHICH IS HER NORMAL SPEED(AS PER THE "DE-ENHANCED PROB"IF SHE WALKED HER NORMAL SPEED) IE 20 MINS"SPEED" ONLY IF ITS 10/20 WILL THE ANSWER COME CORRECT AND FIT THE 30 MINS, 3. THIS IS HOW: 10/20 (ANSWER OPTION) , SO 10D/20+D= 30D/20, SINCE IT TAKES 20 MINS TO COVER D, 30D/20 WOULD TAKE EXACTLY 30 MINS AND THAT MATCHES WITH 20 MINS RIGHT TIME +10 LATE =30 MINS TO COVER 30D/20. 4. SO 9D/20 IS THE APPROX ANSWER THE CORRECT ANSWER AND OPTION IS 10/20 NOT 9/20

samraj n - 6 years, 6 months ago

She was going to be 8 minutes early, but her turn around made her 18 minutes late. Thus she was 9 minutes into her walk when she turned around!

Curtis Fessock - 6 years, 2 months ago

JUST POSTED

samraj n - 6 years, 6 months ago

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