Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 3)
3.
A clock is started at noon. By 10 minutes past 5, the hour hand has turned through:
Answer: Option
Explanation:
Angle traced by hour hand in 12 hrs = 360°.
| Angle traced by hour hand in 5 hrs 10 min. i.e., | 31 | hrs = |  |
360 | x | 31 |  |
° | = 155°. |
| 6 | 12 | 6 |
Discussion:
87 comments Page 1 of 9.
Uma said:
2 decades ago
I can't understand how that 31/6 come?
(1)
Pradeep Gorai said:
2 decades ago
To Uma
5 hr 1o min=310min(5*60+10)
=310/60 hr
=31/6 hr.
or
5 hr 10 min=5+10/60
=31/6
5 hr 1o min=310min(5*60+10)
=310/60 hr
=31/6 hr.
or
5 hr 10 min=5+10/60
=31/6
Nilesh said:
2 decades ago
I cant undrstand how that
31/6 hrs= (360/12 * 31/6) = 155
31/6 hrs= (360/12 * 31/6) = 155
Pradeep said:
2 decades ago
@nilesh
1hr=30 degree
.'. 31/6 hr= 31/6 * 30 =155 deg
1hr=30 degree
.'. 31/6 hr= 31/6 * 30 =155 deg
Sandhya said:
2 decades ago
5.10/60
=5.2/12
=5.1/6
=5*6+1/6
=31/6
=5.2/12
=5.1/6
=5*6+1/6
=31/6
Mariah said:
1 decade ago
What is the formula of changing minutes or hours to degrees?
Nitin harjai said:
1 decade ago
I don't understand "by 10min past 5".
Akshay said:
1 decade ago
10min past 5 is 5:10
so, 5+10/60 =5+1/6(cross multiply)=31/6
so, 5+10/60 =5+1/6(cross multiply)=31/6
Naveed Mohammad said:
1 decade ago
Formula for finding degree when min and hr ar given is
angle = (11/2)*m - 30*h when (11/2)*m > 30*hr
angle = 30*hr-(11/2)*m when (30hr > (11/2)*m
where m = min, hr = hours
=30*5-(11/2)*10
=150-(120/2)
=(300-120)/2
=180/2
=90 degrees
Its a time institute materiel solution.
angle = (11/2)*m - 30*h when (11/2)*m > 30*hr
angle = 30*hr-(11/2)*m when (30hr > (11/2)*m
where m = min, hr = hours
=30*5-(11/2)*10
=150-(120/2)
=(300-120)/2
=180/2
=90 degrees
Its a time institute materiel solution.
Resham said:
1 decade ago
Initially both hands are at 12(noon)
1 hr= 30 dgrs ( 12 to 5 = 5 hrs)
so 5*30 = 150 dgrs and
in 60 mins cover 30 dgrs
in 10 mins= 30/60
in 1 min= 30/60*10= 5 dgrs
so
150 + 5 = 155 dgrs
1 hr= 30 dgrs ( 12 to 5 = 5 hrs)
so 5*30 = 150 dgrs and
in 60 mins cover 30 dgrs
in 10 mins= 30/60
in 1 min= 30/60*10= 5 dgrs
so
150 + 5 = 155 dgrs
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