Aptitude - Time and Distance - Discussion
Discussion Forum : Time and Distance - General Questions (Q.No. 11)
11.
In covering a distance of 30 km, Abhay takes 2 hours more than Sameer. If Abhay doubles his speed, then he would take 1 hour less than Sameer. Abhay's speed is:
Answer: Option
Explanation:
Let Abhay's speed be x km/hr.
| Then, | 30 | - | 30 | = 3 |
| x | 2x |
6x = 30
x = 5 km/hr.
Discussion:
209 comments Page 6 of 21.
Zabi said:
1 decade ago
Great explanation devi.
Anoo said:
1 decade ago
Time in first case= 30/x(30 is distance and x is speed)
Time in second case=30/2x(30 is distance and speed is doubled)
Total difference in time is 3 hrs(2 hrs slow and one hour fast)
(30/x)-(30/2x)=3
Solve and you get 5km/hr.
Time in second case=30/2x(30 is distance and speed is doubled)
Total difference in time is 3 hrs(2 hrs slow and one hour fast)
(30/x)-(30/2x)=3
Solve and you get 5km/hr.
Rahul said:
1 decade ago
Let Abhay's speed be x km/hr
and sameer's speed be y km/hr
Abhay takes 2 hours more than Sameer
i.e (30/x)-(30/y)=2 ........ I
Abhay doubles his speed, i.e his speed becomes 2x
then he would take 1 hour less than Sameer
i.e (30/y)-(30/2x)=1......... II
ADD I and II
you will get
(30/x)-(30/2x)=3.......... III
solve III you will get x=5 km/h
and sameer's speed be y km/hr
Abhay takes 2 hours more than Sameer
i.e (30/x)-(30/y)=2 ........ I
Abhay doubles his speed, i.e his speed becomes 2x
then he would take 1 hour less than Sameer
i.e (30/y)-(30/2x)=1......... II
ADD I and II
you will get
(30/x)-(30/2x)=3.......... III
solve III you will get x=5 km/h
Appu said:
1 decade ago
Nice explanation by Anoo.
Kamal said:
1 decade ago
Reason for substracting two equation is.?
Priya said:
1 decade ago
Reason for substracting?
Varun said:
1 decade ago
Reason for subtracting: Then only you're getting the difference in time of both.
Bhavana said:
1 decade ago
Good explanation by rahul and amith.
Srikara said:
1 decade ago
Good Explanation Devi.. Thanx.. :)
Harish said:
1 decade ago
thanks
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