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:
143 comments Page 11 of 15.
Chandan pal said:
1 decade ago
Avg speed: 2xy/x+y.
Avg speed: 2*21*24/21+24 = 112/5.
Distance = (112/5)*10 = 224.
Avg speed: 2*21*24/21+24 = 112/5.
Distance = (112/5)*10 = 224.
Bhavin said:
3 years ago
x/21 + x/24 = 20.
24x + 21x = 20* 21 *24,
45x = 10,080,
x =10,080/45.
Ans x = 224.
24x + 21x = 20* 21 *24,
45x = 10,080,
x =10,080/45.
Ans x = 224.
(8)
Yuva said:
8 years ago
Here, They Mentioned half of the journey.
They didn't mention half of the time.
They didn't mention half of the time.
(1)
GHUHI said:
1 decade ago
5*21 = 105 KM.
5*24(KM/HR) = 120 KM.
SO TOTAL DISTANCE TRAVEL.
105+120 = 225.
5*24(KM/HR) = 120 KM.
SO TOTAL DISTANCE TRAVEL.
105+120 = 225.
Sri Naveen said:
4 years ago
@Amit Kr. Soni.
Anyone please explain to me that how 7x&8x came there?
Anyone please explain to me that how 7x&8x came there?
(1)
Yuva said:
8 years ago
Clearly, 10hrs is there, why they taken time is X hrs? please explain me.
Damodhar said:
1 decade ago
Average speed = (2*21*24)/(21+24) = 102/5.
Distance = (102*10)/5 = 224.
Distance = (102*10)/5 = 224.
Rishwanth Immaneni said:
7 years ago
Here we get 13x at the place of 15x and the remaining process is same.
Manabendra said:
2 decades ago
Sir, would you please explaine me the 1st line of your explanation?
Er. Ishfaq Hamid said:
9 years ago
As simple as it looks like:
2 * (10 * 21 * 24)/(21 + 24)
= 224 km.
2 * (10 * 21 * 24)/(21 + 24)
= 224 km.
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