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:
226 comments Page 5 of 23.
Deepanshu said:
3 years ago
How did we get 18/5?
(14)
P Lakshmi said:
3 years ago
Changing kmph to mps.
1km = 1000m.
Minute = 60sec.
1000/60×60 = 5/18.
Changing opposite mps to kmph is 18/5.
1km = 1000m.
Minute = 60sec.
1000/60×60 = 5/18.
Changing opposite mps to kmph is 18/5.
(14)
Harsh Mestry said:
1 year ago
The distance travelled is 600m.
He takes 5 min.
Convert min into sec: 5 x 60 = 300 sec.
Speed in m/s = speed = distance/time = 600/300 = 2m/s,
Convert m/s to km/h = 1m/s is considered as 3.6km/h.
So, 2 x 3.6
= 7.2km/h.
He takes 5 min.
Convert min into sec: 5 x 60 = 300 sec.
Speed in m/s = speed = distance/time = 600/300 = 2m/s,
Convert m/s to km/h = 1m/s is considered as 3.6km/h.
So, 2 x 3.6
= 7.2km/h.
(14)
Barkat Shah said:
8 months ago
Simple way to solve this;
Distance = 600m = 600/1000 = 0.6Km.
Time = 5 minutes = 0.08 hours.
Speed = ?.
Now apply the speed formula.
Speed = Distance/Time.
Put value;
Speed = 0.6km/0.08h.
= 7.5km/h.
Distance = 600m = 600/1000 = 0.6Km.
Time = 5 minutes = 0.08 hours.
Speed = ?.
Now apply the speed formula.
Speed = Distance/Time.
Put value;
Speed = 0.6km/0.08h.
= 7.5km/h.
(14)
Sathish M said:
7 months ago
Thanks all for explaining.
(14)
REENA S said:
2 months ago
Distance = 600 m = 0.6 km.
Time = 5 minutes = 5/60 = 1/12 hour.
Speed = Distance/Time.
= 0.6 ÷ (1/12),
= 0.6 × 12,
= 7.2 km/h.
Time = 5 minutes = 5/60 = 1/12 hour.
Speed = Distance/Time.
= 0.6 ÷ (1/12),
= 0.6 × 12,
= 7.2 km/h.
(14)
Rinose said:
2 years ago
It was a format when converted to m/s to km /hr use 18/5 and Km/hr to m/s use 5/18.
(13)
Ramani murugan said:
2 years ago
s = d/t.
d = 600m,
t = 5m.
600/5 * 60,
= 2 * 18/5,
= 2 * 3.2,
= 7.2.
d = 600m,
t = 5m.
600/5 * 60,
= 2 * 18/5,
= 2 * 3.2,
= 7.2.
(13)
Hello said:
1 year ago
@Mercy and @Raj.
18/5 is used when we convert metres per second to km per hour. And 5/18 is used when we convert km per hour to metres per second.
It is a shortcut. As we see 5km/hr to m/sec.
We usually do 5* (1000/60*60) =5* (1000/3600) =5* (10/36) =5* (5/18).
Thus, while converting from km/hr to m/s, using 5/18 is simple.
18/5 is used when we convert metres per second to km per hour. And 5/18 is used when we convert km per hour to metres per second.
It is a shortcut. As we see 5km/hr to m/sec.
We usually do 5* (1000/60*60) =5* (1000/3600) =5* (10/36) =5* (5/18).
Thus, while converting from km/hr to m/s, using 5/18 is simple.
(13)
Rama said:
1 year ago
Speed = Distance ÷ time.
Speed = 600÷(5×60).
Speed = 2 m/sec,
Now, convert into kmph.
i.e.,S = 2×(18÷5).
Then S = 7.2 kmph.
Speed = 600÷(5×60).
Speed = 2 m/sec,
Now, convert into kmph.
i.e.,S = 2×(18÷5).
Then S = 7.2 kmph.
(12)
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