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:
64 comments Page 4 of 7.
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?
Rahul said:
5 years ago
Thanks @Sundar.
Chidara Susmitha said:
3 weeks ago
(2s1s2)/s1 + s2 = average speed.
(2.64.80)/64 + 80 = 71.11.
(2.64.80)/64 + 80 = 71.11.
Anshu said:
1 decade ago
Time = distance speed^-1
time = 160 / 64 = 10 / 4 = 2.5 hour
time taken for the second half = 160 / 80 = 2 hour
total time taken = 4.5 hour
total distance = 160 + 160 = 320
speed = distance time^-1
speed = 320 / 4.5 = 3200/ 45 = 355.5555.../5 = 71.1111........
time = 160 / 64 = 10 / 4 = 2.5 hour
time taken for the second half = 160 / 80 = 2 hour
total time taken = 4.5 hour
total distance = 160 + 160 = 320
speed = distance time^-1
speed = 320 / 4.5 = 3200/ 45 = 355.5555.../5 = 71.1111........
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?
Ranjith said:
2 decades ago
while using the formula for avg speed, as nisha said it gives a different answer..
KOMAL said:
2 decades ago
THANKS TO SUNDER WHO GIVES A GOOD SOLUTION
Renuka said:
2 decades ago
Hi Sundar, very nice explaination, thank you so much.
Priya said:
2 decades ago
@sunder Thanks.
Prveen Bilimoga said:
2 decades ago
I have a doubt, can we do like this, the first 160 hrs is 64 km speed, and the second hr is 80, total 144. so 144/2 = to 72
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