Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 1)
1.
A person crosses a 600 m long street in 5 minutes. What is his speed in km per hour?
Answer: Option
Explanation:
| Speed = |  |
600 |  m/sec. |
| 5 x 60 |
= 2 m/sec.
Converting m/sec to km/hr (see important formulas section)
| = | |
2 x | 18 | |
km/hr |
| 5 |
= 7.2 km/hr.
Discussion:
215 comments Page 13 of 22.
Sasi said:
1 decade ago
We know that, 1 km = 1000 m and 1 hr = 3600 min i.e., 60 min*60 sec.
Like wise, 1 m = 0.001 km and 1 min = 0.00027777777 hr.
Which means, 1 m = 1/1000 = 0.001 km.
1 min = 1/3600=0.00027777777 hr.
So, km/hr = 0.001/0.00027777777 = 3.
6 which means 18/5.
That's why, for km/hr conversion we use 18/5.
Like wise, 1 m = 0.001 km and 1 min = 0.00027777777 hr.
Which means, 1 m = 1/1000 = 0.001 km.
1 min = 1/3600=0.00027777777 hr.
So, km/hr = 0.001/0.00027777777 = 3.
6 which means 18/5.
That's why, for km/hr conversion we use 18/5.
Nvll said:
1 decade ago
@Vinoth.
It doesn't actually matter he will be vaporized in a few ms so will never hear it.
I don't no one person who talks about m/second so why the need to convert to m/s anyway.
I came on to this site to find out what a wind speed of 2 m/s is, who talks about a wind speed of 2 m/s? 7.2 km/hr or 4 m/h or 3.8 knots I can work out, but 2m/s? Very geeky.
It doesn't actually matter he will be vaporized in a few ms so will never hear it.
I don't no one person who talks about m/second so why the need to convert to m/s anyway.
I came on to this site to find out what a wind speed of 2 m/s is, who talks about a wind speed of 2 m/s? 7.2 km/hr or 4 m/h or 3.8 knots I can work out, but 2m/s? Very geeky.
Siva said:
1 decade ago
Where does 18 comes from?
Deba said:
1 decade ago
= (1000/3600) = 5/18 m/sec.
1 km = 1000 m.
1 hr = 3600 sec.
1 km = 1000 m.
1 hr = 3600 sec.
Nik Edrus said:
1 decade ago
How do you get 18/5?
THIRUPATHI said:
1 decade ago
Given that,
Distance(d) = 600 m = 600/1000 km = 0.6 km.
Time(t) = 5 mns = 5/60 hrs = 1/12 hrs.
Now speed = distance/time = 0.6/(1/12) kmph = 0.6*12 = 7.2 kmph.
Distance(d) = 600 m = 600/1000 km = 0.6 km.
Time(t) = 5 mns = 5/60 hrs = 1/12 hrs.
Now speed = distance/time = 0.6/(1/12) kmph = 0.6*12 = 7.2 kmph.
Advait Nandeshwar said:
1 decade ago
Speed = 600 m/5 min.
= 600 m/5*60 sec.
= 600 m/300 sec.
= 2 m/s.
Therefore,
By applying formula.
x km/hr = 18/5 x m/s.
x km/hr = 18/5 x 2.
x km/hr = 36/5.
x km/hr = 7.2.
= 600 m/5*60 sec.
= 600 m/300 sec.
= 2 m/s.
Therefore,
By applying formula.
x km/hr = 18/5 x m/s.
x km/hr = 18/5 x 2.
x km/hr = 36/5.
x km/hr = 7.2.
SUSHIL PATHAK said:
1 decade ago
Hi,
I know that I'm late. But I'm fresher.
Answer:
Option B.
Explanation:
Distance = 600 m.
Time = 5 min.
Speed = 600/5 = 120 m/min or 120*60/1000 = 7.2 km/hr.
I know that I'm late. But I'm fresher.
Answer:
Option B.
Explanation:
Distance = 600 m.
Time = 5 min.
Speed = 600/5 = 120 m/min or 120*60/1000 = 7.2 km/hr.
Sumithra said:
1 decade ago
Good. And why multiply 60 in 2?
Sagar said:
1 decade ago
600/5 = 1000/60. Because we need answer in km/hr.
1km/1hr = 1000 mtrs/60 mins.
There fore cross cross multiplication of 600/5 = 1000/60.
You will get 36000/5000 = 7.2 is the answer. Any doubts?
1km/1hr = 1000 mtrs/60 mins.
There fore cross cross multiplication of 600/5 = 1000/60.
You will get 36000/5000 = 7.2 is the answer. Any doubts?
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