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 5 of 9.
Manasa said:
1 decade ago
Please can any one help out this problem.
How they got 8 in first step?
How they got 8 in first step?
Vikash said:
9 years ago
Change 20 min in an hour then add 8 because take more time we get 25/3.
Mani said:
1 decade ago
Please can any one tell me how did you get the 1/24 in first step?
Manisha said:
1 decade ago
How this 8 value came in equation any one can you please explain?
Sandy said:
1 decade ago
Please can any one tell me how did you get the 8 in first step?
Siddhant ojha said:
8 years ago
The solution given is not right because of 8+2/3=26/3 not 25/3.
Heisenberg said:
2 years ago
@Suresh.
Why 120/x + 480/y = 8, How 8 come?
Please explain.
Why 120/x + 480/y = 8, How 8 come?
Please explain.
(17)
Malathi p said:
1 decade ago
Hi, from where that 25/3 came? Please clarify my doubt sir.
Chandu Balaji said:
8 years ago
Can we use alligation method here. Please clarify my doubt?
Nishanth said:
9 years ago
@Satish. Why you have multiply 25/3*200 please explain?
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