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 11 of 22.
Ganesh said:
1 decade ago
To convert km/hr to m/sec, we hav to do in dis way.....
1km=1000m
1hr=3600sec
1km/hr=1000/3600 m/sec
therefore 1km/hr=5/18 m/sec
Similarly to convert m/sec, we hav to in reverse way.....
1000m=1km ---> m=1/1000km
3600sec=1hr ---> sec=1/3600hr
its just a normal cross multiplication
m/sec=3600/1000 km/hr
therefore m/sec=18/5 km/hr
1km=1000m
1hr=3600sec
1km/hr=1000/3600 m/sec
therefore 1km/hr=5/18 m/sec
Similarly to convert m/sec, we hav to in reverse way.....
1000m=1km ---> m=1/1000km
3600sec=1hr ---> sec=1/3600hr
its just a normal cross multiplication
m/sec=3600/1000 km/hr
therefore m/sec=18/5 km/hr
Riyazahmad said:
1 decade ago
Its simple, no need to go through 18/5. do one thing,
1st convert m/s into km/hr i.e. (2m/s=2*3600/(1000)) after doing this calculation you will get {7.2 km/hr}
1st convert m/s into km/hr i.e. (2m/s=2*3600/(1000)) after doing this calculation you will get {7.2 km/hr}
Ravichandran said:
1 decade ago
600=5minutes therefore
120= 1 minute
60*120=7200 meters
Kilometer per hour = 7.2
Thats all
120= 1 minute
60*120=7200 meters
Kilometer per hour = 7.2
Thats all
Priya said:
1 decade ago
Why we convert 5 min into seconds?
Swayam said:
1 decade ago
@Priya.
Our question is why we convert 5 min into seconds. Its because of the formula i.e. if speed of the body is 'a'm/sec then when we convert it into km/sec, it becomes (a*18/5) km/sec. In both cases time is required in sec. So it is necessary to convert 5 min into sec. Ok ?
Our question is why we convert 5 min into seconds. Its because of the formula i.e. if speed of the body is 'a'm/sec then when we convert it into km/sec, it becomes (a*18/5) km/sec. In both cases time is required in sec. So it is necessary to convert 5 min into sec. Ok ?
Sandip said:
1 decade ago
Simply,
One man cover 600 m in 5 minute
first calculation wht is dist cover for 1 minute
600mtr/5min = 120meter is cover per(1) minute
qus is find the km/perhour
1hour=60minute
120mtr*60minute = 7200meter is cover in 1hour(60minute)
find km
1000meter=1km
=7200/1000=7.2 km/perhour
One man cover 600 m in 5 minute
first calculation wht is dist cover for 1 minute
600mtr/5min = 120meter is cover per(1) minute
qus is find the km/perhour
1hour=60minute
120mtr*60minute = 7200meter is cover in 1hour(60minute)
find km
1000meter=1km
=7200/1000=7.2 km/perhour
Dinen said:
1 decade ago
Very simple,
In 5 mins he covers 600 m.
In 1 min he will cover 600/5.
In 60 mins he will cover (600*60) /5 = 7200 m i.e. 7. 2 km.
In 5 mins he covers 600 m.
In 1 min he will cover 600/5.
In 60 mins he will cover (600*60) /5 = 7200 m i.e. 7. 2 km.
Ravi saini said:
1 decade ago
In 1 km -1000 m
1 hr.-60 min.
1 min.-60 sec.
So, 1 hr.-3600 sec.
metre\hour to k.m\sec.
To do it, 3600.metr\1000.sec.
Now divide 3600 to 1000, we get 18\5.
1 hr.-60 min.
1 min.-60 sec.
So, 1 hr.-3600 sec.
metre\hour to k.m\sec.
To do it, 3600.metr\1000.sec.
Now divide 3600 to 1000, we get 18\5.
Manoj said:
1 decade ago
600 mtr in 5 minutes so
1 km = 1000 mtr
(600/5=120 mtrs per minute) so
1 hour = 60 minutes so
(60*120=7200 mtrs)
Here
(7200/1000)= 7.2 km/hr.
1 km = 1000 mtr
(600/5=120 mtrs per minute) so
1 hour = 60 minutes so
(60*120=7200 mtrs)
Here
(7200/1000)= 7.2 km/hr.
Sekhar said:
1 decade ago
t=5 Mins, 5*60=300sec(1min=60 sec)
SPEED=DISTANCE/TIME
=600/300
=2m/s.
Convert m/s to km/sec by formula
2*18/5
=36/5
=7.2km/hr.
SPEED=DISTANCE/TIME
=600/300
=2m/s.
Convert m/s to km/sec by formula
2*18/5
=36/5
=7.2km/hr.
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