Aptitude - Clock - Discussion
Discussion Forum : Clock - General Questions (Q.No. 7)
7.
At what time between 5.30 and 6 will the hands of a clock be at right angles?
Answer: Option
Explanation:
At 5 o'clock, the hands are 25 min. spaces apart.
To be at right angles and that too between 5.30 and 6, the minute hand has to gain (25 + 15) = 40 min. spaces.
55 min. spaces are gained in 60 min.
| 40 min. spaces are gained in |  |
60 | x 40 |  min |
= | 43 | 7 | min. |
| 55 | 11 |
 Required time = 43 |
7 | min. past 5. |
| 11 |
Discussion:
77 comments Page 2 of 8.
Ankita said:
6 years ago
@Abi and @ Babu.
When two hands coincide after exactly one hour, minutes hand travels one full circle that is 60 spaces but hours hand moves 5 space forward. So after exactly one hour later, they gain 55 spaces are their relative gain.
When two hands coincide after exactly one hour, minutes hand travels one full circle that is 60 spaces but hours hand moves 5 space forward. So after exactly one hour later, they gain 55 spaces are their relative gain.
(2)
MATH EXPERT said:
10 years ago
FORMULA :
Guess P = ANS .
(11/2) x (minutes) - 30 x (Hours) = 90 degree.
11/2 x P - 30 x 5 = 90,
P = 480/11= ANS.
Guess P = ANS .
(11/2) x (minutes) - 30 x (Hours) = 90 degree.
11/2 x P - 30 x 5 = 90,
P = 480/11= ANS.
(1)
Jeyamani said:
1 decade ago
Actually the question is between 5.30 & 6.00. But you have taken from 5.00. Why?
(1)
Priya said:
1 decade ago
Why you are consider 5 while given time is 5:30?
(1)
Sonam said:
7 years ago
Can you explain me the calculation of 43 7/11 min how it comes from (60/55*40) min?
(1)
A. M. said:
9 years ago
The given explanation doesn't consider the movement of the hour hand. Between 5:30 and 6, the hour hand will also have moved. Then the minute hand will need to cover a little more than (25 + 15) minutes' space.
(1)
Jack84 said:
9 years ago
@ALL.
Min=AO
Hour=OB
AOB=25 min apart
To get 90 degree= minutes has to travel another 15 min from 5 O'clock i.e. 5:40 so, 25+15=40 min.
OB i.e.hour hand travels only 5 min in 60 min so=60-5=55 min,
the rest is given by experts.
Min=AO
Hour=OB
AOB=25 min apart
To get 90 degree= minutes has to travel another 15 min from 5 O'clock i.e. 5:40 so, 25+15=40 min.
OB i.e.hour hand travels only 5 min in 60 min so=60-5=55 min,
the rest is given by experts.
(1)
Ragav said:
8 years ago
Why we can't use 30H - 5.5H = 90 formula?
30(11/2) - 5.5H = 90.
30(11/2) - 5.5H = 90.
(1)
ABI said:
6 years ago
55min spaces are gained in 60min. What it is, Can someone explain to me this?
(1)
Lakhan singh meena said:
1 decade ago
Direct formula:
6*x - 90 = 30(y + x/60);
Where y = 5 hr.
So 6x = 30(5 + x/60) + 90;
x = 43(7/11)min. past 5.
6*x - 90 = 30(y + x/60);
Where y = 5 hr.
So 6x = 30(5 + x/60) + 90;
x = 43(7/11)min. past 5.
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