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Aptitude - Time and Distance - Discussion

Discussion Forum : Time and Distance - General Questions (Q.No. 6)
Time and Distance
6.
In a flight of 600 km, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by 200 km/hr and the time of flight increased by 30 minutes. The duration of the flight is:
1 hour
2 hours
3 hours
4 hours
Answer: Option
Explanation:

Let the duration of the flight be x hours.

Then, 600 - 600 = 200
x x + (1/2)

600 - 1200 = 200
x 2x + 1

x(2x + 1) = 3

2x2 + x - 3 = 0

(2x + 3)(x - 1) = 0

x = 1 hr.      [neglecting the -ve value of x]

Discussion:
206 comments Page 13 of 21.
Teju said:   1 decade ago
Hi Pavan......
you are mistaken it is not 3min. it is 30min.
so 30 min. is taken as 1/2 hr.
Prabi said:   5 years ago
@Neeru.

1/2 is because here told that 30 minutes. If it is 60 minutes then it will be 1.
Arul said:   1 decade ago
Why 600/x-600/x+1/2 not 600/x+1/2-600/x?

Please clear the concept. I can't understand.
Ayesha said:   1 decade ago
Still confuse about 600/x-600/(x+1/2) = 200. Please let me know something very simply.
Mamatha said:   7 years ago
After solving the equation x has two values 1 and 3/2. Why only 1 has taken as answer?
Arun said:   1 decade ago
@Ravi, 200 is not the avg speed, it says average speed is reduced by 200, not to 200.
Tejadeep said:   8 years ago
Why we have to consider the difference of two distance can anyone explain? please.
Prabhaakar said:   9 years ago
@Babita.

Why are we taking 600-6000=200?

Can anyone give me the explanation?
Yash Soni said:   3 years ago
Can we take the difference of time instead of speed? Please anyone explain me.
Madhava said:   8 years ago
How 600/x-600/x+1/2=200?

Why we take the difference and why it equal to 200?
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