Capgemini
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Numerical Ability
Time Distance and Speed
2 men at same tym start walking towards each other from A n B 72 kms apart. sp of A is 4kmph.Sp of B is 2 kmph in 1st hr,2.5 in 2nd, 3 in rd. n so on…when will they meet
i in 7 hrs ii at 35 kms from A iii in 10 hrs iv midway
Read Solution (Total 13)
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- Both are in the opposite direction .... so relative speeds =s1+s2;
we know that in first hour A move 4km and B move 2 km=4+2=6km in one hour;
second hour A's speed is constant but B's speed increases by 0.5km that is 2.5=4+2.5=6.5km;
similarly for every one hour the speeds are in Arithematic progression--->6+6.5+7+7.5+8+8.5+9+9.5+10=72km so it takes 9hours to meet....simply add their distances in every hour by keeping A's speed as constant and increase B's speed 0.5km for every hour... - 8 years agoHelpfull: Yes(52) No(5)
- Ans:-- ( iv ) midway
After 9 hours,
A would have travelled 4*9 = 36 km
B would have travelled 2+2.5+3+3.5+4+4.5+5+5.5+6 = 36 km
So, total = 36+36 = 72 km
So, answer = 9 hours / midway - 8 years agoHelpfull: Yes(24) No(6)
- 36 km from A.
bcoz,in first hour speed of a+b is 4+2=6.
in next hour speed is 4+2.5=6.5.
and so on ..
after 9 hours it will become 72 km. - 8 years agoHelpfull: Yes(6) No(3)
- They meet at midway.because A and B travel 36 kms in same time i.e in 9hrs
- 8 years agoHelpfull: Yes(2) No(1)
- mid way
at each hour they will travel 6+6.5+7....10
sole from here - 8 years agoHelpfull: Yes(1) No(0)
- sum of speed is in ap so n/2[2a+(n-1)*0,.5]=72
and hence we get n=9
and now putting the value of n as time we get a travels 36 km
and b travels 36 km and hence the answer is midway - 8 years agoHelpfull: Yes(1) No(0)
- Mr.srikanth plz put ur answer explanatory where i m getting a wrong answer here
- 8 years agoHelpfull: Yes(0) No(1)
- midway 9 hrs
- 7 years agoHelpfull: Yes(0) No(0)
- midway
After 9 hours,
A would have travelled 4*9 = 36 km
B would have travelled 2+2.5+3+3.5+4+4.5+5+5.5+6 = 36 km
So, total = 36+36 = 72 km
So, answer = 9 hours / midway - 7 years agoHelpfull: Yes(0) No(0)
- 36 kms covered both by A and B in 9th hrs so they meet midway
- 7 years agoHelpfull: Yes(0) No(0)
- midway.
72/2 = 36kms.....the distance midway
A to cover 36 takes 9hrs (9*4)
B in 9 hrs cover 36 also (2+2.5+3+3.5+4+4.5+5+5.5+6 = 36)
hence d) midway - 7 years agoHelpfull: Yes(0) No(0)
- distance travelled by A in "x" hrs =4x
distance travelled by B in "x" hrs =x/2(2+x/2)
and x/2(2+x/2)=72-4x
x=9,-32
so distance =36 km by A and B
so they meet midway - 7 years agoHelpfull: Yes(0) No(0)
- Answer : midway
Let's divide the distance by two ...
72/2 = 36kms.....the distance midway
A to cover 36 takes 9hrs (9*4)
B in 9 hrs cover 36 also (2+2.5+....+6 = 36)
hence answer is Midway - 4 years agoHelpfull: Yes(0) No(1)
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