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 21 of 22.
MERCY said:
6 months ago
How do we get 18/5? Please explain to me.
(18)
Devendra rajput said:
5 months ago
Your Explanation is better than others. Thanks @Lavanya.
(4)
Gajanan said:
5 months ago
Why it multiply with 18/5? Please explain.
(11)
Suman said:
5 months ago
Thanks everyone, for giving a clear explanation.
(1)
UMAKANT CHAUDHARY said:
5 months ago
Let's Convert distance metres to km;
600/1000 km = 0.6km.
Now, same as time, 5/60 = 1/12 hr.
Now speed = distance/time.
= 0.6/(1/12),
= 0.6 * 12,
= 7.2 km.
600/1000 km = 0.6km.
Now, same as time, 5/60 = 1/12 hr.
Now speed = distance/time.
= 0.6/(1/12),
= 0.6 * 12,
= 7.2 km.
(35)
Dffse said:
4 months ago
Can anyone explain it clearly?
(7)
Majji deepika said:
4 months ago
Given data.
Distance(d) = 600m
Time(t) = 5m(converting into sec)
t = 5 * 60 = 300s.
Find : speed = ?(in km/hr)
Now apply the formulaic;
Speed =distance/time
Speed=600/300=2m/s
So, over answer is km/hr.
Now the formula is (a m/s=a*(18/5)km/hr)
Now apply
2m/s = 2 * (18/5)km/hr.
Speed = 7.2km/hr.
Distance(d) = 600m
Time(t) = 5m(converting into sec)
t = 5 * 60 = 300s.
Find : speed = ?(in km/hr)
Now apply the formulaic;
Speed =distance/time
Speed=600/300=2m/s
So, over answer is km/hr.
Now the formula is (a m/s=a*(18/5)km/hr)
Now apply
2m/s = 2 * (18/5)km/hr.
Speed = 7.2km/hr.
(9)
Soumya Ranjan said:
4 months ago
In 5min 600m,
In 1min, 600/5 = 120m,
In 1hr, 120 * 60 = 7200m,
1km = 1000m,
So, 7200m = 7.2km.
In 1min, 600/5 = 120m,
In 1hr, 120 * 60 = 7200m,
1km = 1000m,
So, 7200m = 7.2km.
(50)
Hello said:
4 months 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.
(10)
Harsh Mestry said:
3 months 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.
(12)
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