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 9 of 9.
Das said:
1 decade ago
Hi could you tel me how this 1/15 came in Step 1 ?
Hrushikesh said:
2 decades ago
Its not 8*(20/60). Its 8+(20/60) that gives us 25/3.
(1)
Anu said:
2 decades ago
Hey as it takes 20mins more for car to travel 200km... then time becomes 8hrs20mins.... so by converting dis time totally into hrs... 8*(20/60)...dis fraction brings u 25/3.
Vids said:
2 decades ago
Hi, from wher that 25/3 came?
(2)
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