Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 15)
15.
At what time between 9 and 10 o'clock will the hands of a watch be together?
Answer: Option
Explanation:
To be together between 9 and 10 o'clock, the minute hand has to gain 45 min. spaces.
55 min. spaces gained in 60 min.
| 45 min. spaces are gained in |  |
60 | x 45 |  min or 49 |
1 | min. |
| 55 | 11 |
 The hands are together at 49 |
1 | min. past 9. |
| 11 |
Discussion:
48 comments Page 4 of 5.
Shree Hema said:
2 decades ago
@manish
better use this formula
theta=11(m)/2-30(h)
if both hands coincide degree ll be 0
if both hands r in opposite direction degree will be 180
if both hands r in right angle degree will be 90
here it coincides so 0 degree
we have to find min only so keep that parameter(m) as it is, use minimum hour for hour parameter(h=9)
0=11(m)/2-30(9)
m=49 1/11
Got It???
better use this formula
theta=11(m)/2-30(h)
if both hands coincide degree ll be 0
if both hands r in opposite direction degree will be 180
if both hands r in right angle degree will be 90
here it coincides so 0 degree
we have to find min only so keep that parameter(m) as it is, use minimum hour for hour parameter(h=9)
0=11(m)/2-30(9)
m=49 1/11
Got It???
Krishnadas said:
2 decades ago
@sree. Good work. But is this formula standard?
Avijeetkumar said:
2 decades ago
@shree. You are right.
Senthamizh said:
2 decades ago
@Shree: is that standard formula???
Anil said:
1 decade ago
If time is between x and y:
[x*5+angle]*(12/11) past x.
[x*5+angle]*(12/11) past x.
Pradeep said:
1 decade ago
Here we can use the formula:
theta=11(m)/2-30(h)
same direction means 0 degree; hour=9
180=11(m)/2-30(9)
m=49 1/11
theta=11(m)/2-30(h)
same direction means 0 degree; hour=9
180=11(m)/2-30(9)
m=49 1/11
Jasraj khatri said:
1 decade ago
When minute hand reach to 9, hour hand reach near to 10. Then why you count 45 spaces?
Aarthi said:
1 decade ago
Can you tell me the correct explanation?
$hr!dhar said:
1 decade ago
@Shree Hema: Hats Off To u!!! Awsm Formula!!
thnks ;)
can u plz give derivation of formula...
thnks ;)
can u plz give derivation of formula...
Goku said:
1 decade ago
Keep it simple friends! Just use this formula.
12/11 (minutes to be gained). See in the question between 9 to 10'o clock we know that at 9:45 the hands will coincide so 45 minutes is to be gained from 9 o'clock.
So 12/11* (45) =49 1/9 (Answer).
12/11 (minutes to be gained). See in the question between 9 to 10'o clock we know that at 9:45 the hands will coincide so 45 minutes is to be gained from 9 o'clock.
So 12/11* (45) =49 1/9 (Answer).
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