Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 9)
9.
A man on tour travels first 160 km at 64 km/hr and the next 160 km at 80 km/hr. The average speed for the first 320 km of the tour is:
Answer: Option
Explanation:
| Total time taken = |  |
160 | + | 160 |  hrs. |
= | 9 | hrs. |
| 64 | 80 | 2 |
 Average speed = |
|
320 x | 2 | km/hr |
= 71.11 km/hr. |
| 9 |
Discussion:
63 comments Page 4 of 7.
S. M. said:
1 decade ago
Simple method :- (64+84)/2 =72
Thus on safer side,
we can go with C.) 71.11 km/hr
Thus on safer side,
we can go with C.) 71.11 km/hr
Kapil said:
1 decade ago
Since distance is same,so
avg speed= 2xy/(x+y)
avg s= (2*64*80)/(64+80)
=71.11
avg speed= 2xy/(x+y)
avg s= (2*64*80)/(64+80)
=71.11
Ranjith said:
2 decades ago
while using the formula for avg speed, as nisha said it gives a different answer..
Samiksha said:
1 decade ago
Simply you can aplly the formula ie,
2ab/a+b
then, you will get your answer.
2ab/a+b
then, you will get your answer.
Bloci said:
12 months ago
By using Formula.
2s1s2/s1 + s2.
2 * 80 * 64/80 + 64.
10240/144,
71.11 km/hr.
2s1s2/s1 + s2.
2 * 80 * 64/80 + 64.
10240/144,
71.11 km/hr.
(9)
S.DineshKumar said:
2 decades ago
Can you explain how 9/2 hrs came ...
Can you explain the question ones again?
Can you explain the question ones again?
Nishit said:
6 years ago
@All.
Average speed means time is constant. So time would be same. Right?
Average speed means time is constant. So time would be same. Right?
Swapnil said:
9 years ago
(64+80)/2 = 72.
This answer aprox to 71.11
Therefore the answer is 71.11.
This answer aprox to 71.11
Therefore the answer is 71.11.
Shivani said:
8 years ago
Sir, it is asking for 320 km so how can we apply this formula 2xy/ (x+y)?
Vivek said:
1 decade ago
Hi @Jai
5/2*2/1=by cross multiplication
We have get 5+4/2=9/2
5/2*2/1=by cross multiplication
We have get 5+4/2=9/2
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