Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 7)
7.
A man complete a journey in 10 hours. He travels first half of the journey at the rate of 21 km/hr and second half at the rate of 24 km/hr. Find the total journey in km.
Answer: Option
Explanation:
| (1/2)x | + | (1/2)x | = 10 |
| 21 | 24 |
 |
x | + | x | = 20 |
| 21 | 24 |
15x = 168 x 20
| x = |
 |
168 x 20 |  |
= 224 km. |
| 15 |
Discussion:
141 comments Page 12 of 15.
Sai kumar said:
7 years ago
I didn't understand this, can you explain this question?
Joy said:
2 years ago
I am not understanding this. Please help me to get this.
(6)
Matheshg said:
4 years ago
@Sarika Datir.
The formula is used when D is constant.
The formula is used when D is constant.
Ravinder Choudhary said:
2 years ago
X/21 + X/24 = 10,
15X/168 = 10,
X = 112,
2X = 224.
15X/168 = 10,
X = 112,
2X = 224.
(18)
Bappi sah said:
8 years ago
You can also solve it by applying formula 2xy/x+y.
Gayu said:
1 decade ago
I can't understand this problem. Please explain.
Hemansu said:
1 decade ago
Can anyone explain me how did we get 20minutes.
Gowri said:
9 years ago
Please explain the first line of the solution.
Akshay said:
2 years ago
2xy/x+y.
= 2*21*24/21+24.
= 1008/45
= 224km.
= 2*21*24/21+24.
= 1008/45
= 224km.
(37)
S.vikash said:
1 decade ago
How you multiplied with (1/2) in first step?
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