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?
3.6
7.2
8.4
10
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:
194 comments Page 2 of 20.

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

Anmol said:   7 years ago
Hi everyone,

Speed = Distance/Speed
Time= Distance/Speed
Distance=Speed x Time

1km=1000m,and 1hr=3600seconds
Therefore, 1km/hr=1000m/3600sec =5m/18sec=5/18m/s.

Therefore,
to change a speed in km/hr to a speed in m/sec, multiply by5/18.
Conversely, to change a speed in m/sec to a speed in km/hr, multiply by 18/5.

Dewesh Mishra said:   2 years ago
Distance = 600 m = 0.6 km (since 1 km = 1000 m).
Time = 5 minutes = 5/60 hours (since 1 hour = 60 minutes).

Now we can use the formula:

Speed = Distance/Time.
Speed = 0.6 km / (5/60) hours
Speed = 0.6 km / 0.08333 hours.
Speed = 7.2 km/h

Therefore, the person's speed is 7.2 km/h (kilometres per hour).
(18)

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.

Shivani said:   7 years ago
@Dorothyeva.

Speed = distance /time.
D=600 m,
T=5 minutes,
T=5*60 sec,
Now put into formula.

Speed= 600/300 (m/s).
But we are required to find it in km/hr.
Km/hr......> m/s. (Multiply it by 5/18).
m/s..........> km/hr. (Multiply it by 18/5).
S =(600/300) * 18/5.
S=36/5.
Speed = 7.2 km/hr.

Bukhari said:   8 years ago
It is very simple. If someone covers a distance of 600 meters in 5 minutes then in 1hour (60 minutes) he will cover a distance is,

600 metre = 5 minutes.
Multiplying with 12 both sides.
600 x 12 = 5 x 12,
7200 m = 60 minutes (1 hour),
7200/1000 m = 1 hour,
7.2 km in one hour.
So, speed is 7.2 km/hour.

Sheela M B said:   1 decade ago
To: Digant, Deepak. Pk, Sundar and Ravi S

Great guys. All of you have helped freshers in every best possible way to learn through... And freshers need not panic, go through all suggestions and sure you shall end up with happy results. & its an enlightning that you never forget your basics.

Liyaqat said:   9 years ago
@Suriya.

As we know 1km/hour=1000m / 60min x 60sec [bcoz 1km=1000m n 1h=60sec x 60min].

So 1 km/hour = 5/18 m/s.

Now listen if we convert km/h into m/s then we x 5/18.

If we convert m/s into km/h then we x 18/5. So 18 is there. Because we take a reciprocal during conversion of m to km.

Vishwa said:   5 years ago
@Sanju,

They said that 600m covered in 5 mins,
How much will he cover in 1hour? right.
just cal. it as
1hr= 60mins right,
Given in 5mins=600m then,
in 60mins=?

Calculate and find out one min distance that is 600/5=120m per min he travels.
So then for 60mins=60*120=7200m i.e, 7.2km.

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


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