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 5 of 6.
Rahul said:
1 decade ago
Train 2 speed is 100km/hr
100/8=12.5
12.5*7=87.5 train 1 speed =answer
100/8=12.5
12.5*7=87.5 train 1 speed =answer
Sri said:
9 years ago
Here is the simple method :
400/8 = 50.
400 - 50 = 350.
350/4 = 87.5.
400/8 = 50.
400 - 50 = 350.
350/4 = 87.5.
Shahbaz Ahmad said:
5 years ago
7/8 = x/400/4,
7/8 = x/100,
x = 7 x 25/2 = 175/2 = 87.5km/hr.
7/8 = x/100,
x = 7 x 25/2 = 175/2 = 87.5km/hr.
(4)
Sai said:
9 years ago
Thank you all for explaining the solution in different ways.
Suhail ahmed g said:
8 years ago
We can do it directly,
400/4=100,
(7/8)*100=87.5.
400/4=100,
(7/8)*100=87.5.
Raghu said:
10 years ago
400/4 = 100 km/hr.
8/7 = 100/x.
x = 87.5.
8/7 = 100/x.
x = 87.5.
Dev said:
8 years ago
@Anika.
The speed is 1927. Is it right?
The speed is 1927. Is it right?
Yogi said:
4 years ago
7/8 = x/100,
7*100/8 = x,
87.5 = x.
7*100/8 = x,
87.5 = x.
(14)
Awesomeness said:
1 decade ago
This problem was really easy!:).
Arjun said:
1 year ago
The right answer is 87.5 km/hr.
(2)
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