Race..

This topic has expert replies
User avatar
Legendary Member
Posts: 866
Joined: Mon Aug 02, 2010 6:46 pm
Location: Gwalior, India
Thanked: 31 times

Race..

by goyalsau » Tue Nov 09, 2010 5:21 am
A and B run a 1,760m race ending in a dead heat. At first A runs 20% faster than B. B then quickens his pace, and for the remaining distance runs 20% faster than A. When B quickens his pace, A has already run,

a) 800 m
b) 1000 m
c) 790 m
d) 960 m
e) 900 m

OA is D

Guys, Please Help
Saurabh Goyal
[email protected]
-------------------------


EveryBody Wants to Win But Nobody wants to prepare for Win.

User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Tue Nov 09, 2010 6:08 am
A
-------------

Da=Sa*T

Sa=1.2sb

-->Da=1.2*Sb*T

Da=1.2*Db

After B quicken his pace.

Db=1760-Da

Db=1760-1.2Db

-->Db=800

Da=1.2*800=960

Pick D
--Anand--

User avatar
Legendary Member
Posts: 866
Joined: Mon Aug 02, 2010 6:46 pm
Location: Gwalior, India
Thanked: 31 times

by goyalsau » Tue Nov 09, 2010 7:54 am
selango wrote:A
-------------

Da=Sa*T

Sa=1.2sb

-->Da=1.2*Sb*T

Da=1.2*Db

After B quicken his pace.

Db=1760-Da { Can you please explain this one, } From where you got this relation.

Db=1760-1.2Db

-->Db=800

Da=1.2*800=960

Pick D
Saurabh Goyal
[email protected]
-------------------------


EveryBody Wants to Win But Nobody wants to prepare for Win.

User avatar
Legendary Member
Posts: 1460
Joined: Tue Dec 29, 2009 1:28 am
Thanked: 135 times
Followed by:7 members

by selango » Tue Nov 09, 2010 9:12 am
Total distance=1760

First A ran faster than B and covered the distance Da

Remaining distance covered by B is 1760-Da
--Anand--