Aptitude - Time and Distance - Discussion

Discussion Forum : Time and Distance - General Questions (Q.No. 2)
2.
An aeroplane covers a certain distance at a speed of 240 kmph in 5 hours. To cover the same distance in 1 hours, it must travel at a speed of:
300 kmph
360 kmph
600 kmph
720 kmph
Answer: Option
Explanation:

Distance = (240 x 5) = 1200 km.

Speed = Distance/Time

Speed = 1200/(5/3) km/hr.     [We can write 1 hours as 5/3 hours]

Required speed = 1200 x 3 km/hr = 720 km/hr.
5

Discussion:
145 comments Page 1 of 15.

Dayakar jitti said:   6 days ago
The given distance is =1200km.
speed =distance/time.

To cover the same is distance in 1^2/3 hours
which means we can write 1 power 2/3 as 1+2/3 therefore convert into fractions as,
1^2/3 = 1 + 2/3 = 3 * 1 + 2/3 which is 5/3 right so
according to the given problem we have to calculate the required speed.
Then speed =(1200 x 3/5)km/hr = 720 km/hr.

Ssewajje Debbie said:   3 weeks ago
But how does 5/3 turn to 3/5? Please explain.
(1)

Shakti said:   4 months ago
How We can write 1 2/3hours as 5/3 hours?

Please explain.
(19)

Buvaneswaran V said:   4 months ago
Give:
S1 = 240kmph.
T1 = 5 hours.
T2 = 1 1/2 hours = 5/3 hours.
D1=D2.

To Find:
S2 = ?
Solution:
D = S x T.
D1 = D2.
So, S1 x T1 = S2 x T2.
240 x 5 = S2 x 5/3.
S2 = (240 x 5 x 3 )/5.
(16)

Jeswin said:   5 months ago
Please Explain how and why the reciprocal became 5/3 to 3/5. Someone, could you explain it?
(9)

Rojob said:   7 months ago
Distance are same. So, we can write;
D1 = D2.
S1*T1 = S2*T2.
240*5 = S2*5/3,
S2 = 240*3,
S2 = 720kmph.
(37)

Chandra sekhar said:   7 months ago
How 1200/5/3 became 1200/3/5? Please Explain me.
(10)

Prashanth said:   7 months ago
1(2/3) is a mixed fraction.
= 1*2/3.

= Now we have to multiply denominator to 1 (1*3)
=3 + 2/3 = 5/3.
(17)

Vaishnavi Kasana said:   8 months ago
In question it's given in mixed fraction, therefore it will be converted into fraction i.e 5/3 hrs.
(3*1)+2=5.
Fraction = 5/3hrs.
(7)

Anisha said:   9 months ago
How does 2/3 become 3/5? Please explain to me.
(10)


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