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.
Maruti said:
7 years ago
Thanks for the solution @Siddharth.
Kishor said:
7 years ago
How can convert 5hrs 48min to 5( 4/5) hrs?
Tharun Dyanish said:
8 years ago
1 hr 40 kins 48 secs=1.68hrs. The speed is 42/1.68=25.
25*5/7=125/7=17 6/7.
But I want to know how it came 30?
25*5/7=125/7=17 6/7.
But I want to know how it came 30?
Siba Prasad Sahoo said:
8 years ago
First modify all in hour.
So,
1hour+ 40/60hour+48/3600hour,
1+2/3+1/75=126/75 hour.
So,
1hour+ 40/60hour+48/3600hour,
1+2/3+1/75=126/75 hour.
P.micheal said:
8 years ago
Hi. Why don't we cut 126/75=42/25? If it's right means the answer will become 25. Is it right or wrong?
Kittu said:
8 years ago
Thanks @Siddharth.
Murali Krishna said:
8 years ago
Thanks @Siddharth.
Kazi faruque said:
8 years ago
Thanks @Siddharth.
Hareesh said:
8 years ago
Thanks @Siddharth.
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.
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