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 13 of 15.
Leelakrishna said:
1 decade ago
2/v = (1/v1)+(1/v2) find v then d = v*t.
Madivarma said:
8 years ago
21+24 = 45..
45/2 = 22.5.
22.5x10 = 225.
45/2 = 22.5.
22.5x10 = 225.
Soham said:
8 years ago
21+24 = 45,
45/2 = 22.5,
22.5x10 = 225.
45/2 = 22.5,
22.5x10 = 225.
Madhu said:
8 years ago
Thanks for your explanation @Sajan.
Shivasagar said:
2 years ago
= 2 x 21 * 24/21 + 24 * 10.
= 224.
= 224.
(8)
Lakshmi said:
1 decade ago
Can anyone explain me 2nd step.
Sidhila said:
1 decade ago
@abhishek
How did you get 20?
How did you get 20?
Rubi said:
8 years ago
2*21*24/21*24 = 22.4*10 = 224.
Getrude mlay said:
9 years ago
Thank you so much @Sakthivel.
Santu said:
5 years ago
How come 15? Please explain.
(1)
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