Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 5)
5.
Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?
Answer: Option
Explanation:
Due to stoppages, it covers 9 km less.
| Time taken to cover 9 km = |  |
9 | x 60 |  min |
= 10 min. |
| 54 |
Discussion:
205 comments Page 18 of 21.
Kunal said:
1 decade ago
If the bus doesn't stop for an hour it travels 54 km at a constant speed of 54kph. But it stops for some time 't' and covers 45 km in the remaining (60-t) mins at 54kph.
45 = (60-t) * (54/60) => t=10mins.
45 = (60-t) * (54/60) => t=10mins.
Denis said:
1 decade ago
Thanks Kushal.
Shro said:
1 decade ago
Hey somebody explain it clearly 54km/hr-45km/hr=9km/hr
Why to consider only 9km?
why not 9km/hr?
The answer is clearly 9km /hr.
Then why to convert it into minutes?
it should be only 9/54= 1/6 or say 0.16
Why to consider only 9km?
why not 9km/hr?
The answer is clearly 9km /hr.
Then why to convert it into minutes?
it should be only 9/54= 1/6 or say 0.16
Krishn said:
1 decade ago
I still didn't understand.
If 54km - 45 km = 9 km. That is speed reduces by 9 km/hr.
So 60/9 = 20/3 per min...now how do i proceed next?
If 54km - 45 km = 9 km. That is speed reduces by 9 km/hr.
So 60/9 = 20/3 per min...now how do i proceed next?
Kasi said:
1 decade ago
Good explanation kushal :)
Ajit said:
1 decade ago
Simple is that you hav to calculate the wasted time=time taken by bus to cover 9kms).
In one min it covers 0.9 kms.
For 9kms-?min.
You get 10min.
In one min it covers 0.9 kms.
For 9kms-?min.
You get 10min.
Dhruv said:
1 decade ago
Good explanation jaya.
Chetna said:
1 decade ago
Why we consider only 54 but not 45?
Sumit said:
1 decade ago
The time taken by the bus for i k.m is 60/54=1.11 min
so if the bus travels 9 k.m less due to stoppage
then the ans will be =1.11*9=10 min.
so if the bus travels 9 k.m less due to stoppage
then the ans will be =1.11*9=10 min.
Piyus said:
1 decade ago
Why it will be 10 minutes instead of 12 minutes ?
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