Aptitude - Time and Distance - Discussion

Use simple logic.

Just one thing is there, basic.
Speed is distance/time.


Since distance is 600m so its 0.6km.
Time is 5 min, so its 5/60, 1/12.

Now, speed= distance/time
speed = 0.6/1by12
hence speed = 0.6*12
think as 10x6 is 60 plus 2 x 6 12.
so 60+12 72.
7.2 answer.

1km=1000meters.
l hr=3600 sec.
So, the speed =distence/time.
If we simplify
1000/3600=5/18 m/s we get.
converting m/s to km/hr ,

m/s = (1/1000)*3600=18/5 km/hr. We get in the given problem, the speed is converting ms to km is,
2*18/5=7.2 km/hr we get.

Thank you all for explaining it.

@Shikha.

1m/s=18/5km/h.

1Meter/minute=0.06km/hr.

Speed=600/5 meter/minute.
Speed=120.
120 meter/minute=120*0.06 km/hr
=7.2km/hr.

120 meter/minute=120*0.06 km/hr
=7.2 km/hr.

I do not understand where 18 came from? Please Explain me.

The speed formula= distance/time.

So we have speed=600 metres/ 5 min
In this 5 is a minute value so we have to convert it into seconds
Because metres/seconds is a current formula
so we need to change the 5 min value into seconds
1 min= 60 seconds.
So 5 min = 5*60.
= 300 sec that's why 60 will come in this section
now we calculate speed = 600/300 m/sec.
= 2 m/sec

On step 2:
we need the man speed in km/hour.
so we need to convert m/sec into km/hour.
using 1000/3600= 5/18.
Because 1 km= 1000 m.
and 1 hour= 3600 sec ( 1min= 60 sec then 1hour= 60 min so 60*60= 3600 sec)
the answer is 2*5/18= 7.2 km/hour.

@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.

Easy way to solve this problem.

Speed=Distance/Time.
Now,
1km=1000m,
1/1000km=1m,
600/1000km=600m,
i.e. 0.6km=600m,
1hr=60min,
1/60hr=1min,
5/60hr=5min, i.e. 0.083hr=5min.

speed=distance/time.
=(600/5)m/sec.
=(0.6/0.083)km/hr.
speed=7.22km/hr.

Speed = dis/time so speed = 600/5 convert it directly to km/hr (1 km= 1000m and1 hour = 60 minutes).

So, speed = 600*60/5*1000 = 7.2km/hr.