Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 10)
10.
A car travelling with 
of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
of its actual speed covers 42 km in 1 hr 40 min 48 sec. Find the actual speed of the car.
Answer: Option
Explanation:
| Time taken = 1 hr 40 min 48 sec = 1 hr 40 | 4 | min = 1 | 51 | hrs = | 126 | hrs. |
| 5 | 75 | 75 |
Let the actual speed be x km/hr.
| Then, | 5 | x x | 126 | = 42 |
| 7 | 75 |
 x = |
 |
42 x 7 x 75 |  |
= 35 km/hr. |
| 5 x 126 |
Discussion:
117 comments Page 5 of 12.
Sidzwozz said:
9 years ago
@Kasaiah.
Please see above discussions, there is already so many threads of same question. They have explain it very simple manner. Follow one you find easy and quick. :)
Please see above discussions, there is already so many threads of same question. They have explain it very simple manner. Follow one you find easy and quick. :)
Uday said:
7 years ago
1 hour= 60 mins.
40 mins= 40/60 =0.6667hr.
48 sec = 48/60*60= 0.01333 hr.
1 hr 40 mins 48 sec = 1.68 hr.
42km/1.68 hr => 25kmph.
5/7 = 25kmph.
25 * 7/5 = 35kmph.
40 mins= 40/60 =0.6667hr.
48 sec = 48/60*60= 0.01333 hr.
1 hr 40 mins 48 sec = 1.68 hr.
42km/1.68 hr => 25kmph.
5/7 = 25kmph.
25 * 7/5 = 35kmph.
Imtiaz said:
4 years ago
To convert the time 1 hr 40 min 48 sec to hours,
Hours = 1 + (40 ÷ 60) + (48 ÷ 3600),
Hours = 1 + 0.67 + 0.0134.
Hours = 1.68 hrs, which is nothing but 126/75.
Hours = 1 + (40 ÷ 60) + (48 ÷ 3600),
Hours = 1 + 0.67 + 0.0134.
Hours = 1.68 hrs, which is nothing but 126/75.
Shreenath said:
1 decade ago
Hi, I am Shreenath and want to know how 1hr 40mins 48secs is converted into 1hr 40 4/5, and then equal to 1 51/75 dint got the method dear.
Tarun said:
1 decade ago
Time taken = 1 hr 40 min 48 sec = 1 hr 40 4/5 min.
= 126/75 hrs.
Actual speed X kmph.
Then Xx126/75 = 42.X = 25 kmph.
35 is incorrect.
= 126/75 hrs.
Actual speed X kmph.
Then Xx126/75 = 42.X = 25 kmph.
35 is incorrect.
Nikita said:
1 decade ago
Let first consider 48sec
So, 48/60=4/5 min
then
40+4/5=204/5;
Convert this into hour
i.e (204/5)/60=51/75
Total
1+(51/75)=126/75
So, 48/60=4/5 min
then
40+4/5=204/5;
Convert this into hour
i.e (204/5)/60=51/75
Total
1+(51/75)=126/75
Amit said:
8 years ago
1hr 40min 48sec.
1hr 40min 48/60 ---to convert sec to min.
1hr 40min 4/5.
1hr 40/60 4/5 ---to convert min to hr.
1hr 51/75.
1hr 40min 48/60 ---to convert sec to min.
1hr 40min 4/5.
1hr 40/60 4/5 ---to convert min to hr.
1hr 51/75.
Shro said:
1 decade ago
@Abhishek
I din't understand 4th line..
= 1hr +(40.8/60)hr [as,(40.8/60)=(68/100)]
please explain it...
how 40.8/60= 68/100?
I din't understand 4th line..
= 1hr +(40.8/60)hr [as,(40.8/60)=(68/100)]
please explain it...
how 40.8/60= 68/100?
Harshaa said:
7 years ago
1H 40M 48S.
First convert 48 sec to minutes min then 48/60 = 4/5.
Convert 40+4/5 nin to hours 51/75,
Then 1 51/75 = 126/75.
First convert 48 sec to minutes min then 48/60 = 4/5.
Convert 40+4/5 nin to hours 51/75,
Then 1 51/75 = 126/75.
Shiva said:
1 decade ago
Conversion of km/hr to m/sec :
x km/hr = (x * (5/18)) m/sec
Conversion of m/sec to km/hr :
x m/sec = (x * (18/5)) km/hr
x km/hr = (x * (5/18)) m/sec
Conversion of m/sec to km/hr :
x m/sec = (x * (18/5)) km/hr
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