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 10 of 21.
Tejeshwar Rao said:
8 years ago
Distance=30km.
Let the speeds of abhay be x kmph and sameer be y kmph.
Then,
30/x - 30/y =2 ---> I.
When abhay doubles his speed
30/y - 30/2x = 1 ---> II
By I + II we get,
30/x - 30/2x=3
6x=30.
x=5km/hr.
Let the speeds of abhay be x kmph and sameer be y kmph.
Then,
30/x - 30/y =2 ---> I.
When abhay doubles his speed
30/y - 30/2x = 1 ---> II
By I + II we get,
30/x - 30/2x=3
6x=30.
x=5km/hr.
Wasiq said:
8 years ago
Best and helpful explanation, thanks @Devi.
Neha said:
8 years ago
Why subtraction takes place? Please, tell me the reason.
Shru said:
8 years ago
Good explanation @Devi.
Rocky said:
8 years ago
@Mayank.
When Abhay speed was x he reached 2 hours early.
And when it doubled he reached 1 hour early then what it usually took for him.
So he reached 3 hours early when he doubled his speed.
When Abhay speed was x he reached 2 hours early.
And when it doubled he reached 1 hour early then what it usually took for him.
So he reached 3 hours early when he doubled his speed.
UDAY said:
8 years ago
Your method is correct and easy to understand @Devi.
Deepika said:
8 years ago
Thanks for the clear solution @Devi.
Reshma rgukt said:
8 years ago
@Devi.
Your explanation was very good. I understood very well. Thanks.
Your explanation was very good. I understood very well. Thanks.
Ashish kumar mishra said:
8 years ago
Why subtraction between 30/x-30/2x = 3?
Haeshal said:
8 years ago
I don't understand it. Please, someone explain it.
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