Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 13)
13.
It takes eight hours for a 600 km journey, if 120 km is done by train and the rest by car. It takes 20 minutes more, if 200 km is done by train and the rest by car. The ratio of the speed of the train to that of the cars is:
Answer: Option
Explanation:
Let the speed of the train be x km/hr and that of the car be y km/hr.
| Then, | 120 | + | 480 | = 8  |
1 | + | 4 | = | 1 | ....(i) |
| x | y | x | y | 15 |
| And, | 200 | + | 400 | = | 25 | |
1 | + | 2 | = | 1 | ....(ii) |
| x | y | 3 | x | y | 24 |
Solving (i) and (ii), we get: x = 60 and y = 80.
Ratio of speeds = 60 : 80 = 3 : 4.
Discussion:
84 comments Page 6 of 9.
P Chandini said:
7 years ago
If the ratio is known 3:4. How can we find the speed?
Kavitha said:
1 decade ago
This problems in last step step cannot do understand?
Hrushikesh said:
2 decades ago
Its not 8*(20/60). Its 8+(20/60) that gives us 25/3.
(1)
Sai said:
6 years ago
How to find the x and y values can anyone help me?
(2)
Suresh said:
4 years ago
Why 120/x + 480/y = 8, How 8 come? Please explain.
(15)
Das said:
1 decade ago
Hi could you tel me how this 1/15 came in Step 1 ?
Darshan Kumar said:
1 decade ago
Hi , Any one can tell me in detail how 25/3 came ?
Liton das said:
8 years ago
25/3 how did it convert to 1/24?
Please explain.
Please explain.
Rocky said:
10 years ago
8+20/60 = 25/3.
1 hr = 60 min.
1 min = 1/60 hr.
1 hr = 60 min.
1 min = 1/60 hr.
Narendra said:
10 years ago
There is short cut method equation 1/equation 2.
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