Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 8)
8.
The ratio between the speeds of two trains is 7 : 8. If the second train runs 400 km in 4 hours, then the speed of the first train is:
Answer: Option
Explanation:
Let the speed of two trains be 7x and 8x km/hr.
| Then, 8x = |  |
400 |  |
= 100 |
| 4 |
 x = |
|
100 | |
= 12.5 |
| 8 |
Speed of first train = (7 x 12.5) km/hr = 87.5 km/hr.
Discussion:
51 comments Page 6 of 6.
Har said:
10 months ago
400/4 = 100 km/hr.
after this;
100/8 = 12.5 parts of the second train.
100 - 12.5 = 87.5 km/hr for the first train.
after this;
100/8 = 12.5 parts of the second train.
100 - 12.5 = 87.5 km/hr for the first train.
(4)
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