Elitmus
Exam
Numerical Ability
Time Distance and Speed
a is twice as fast as b and b is thrice as fast as c.the journey covered by c in 3/2 hrs will be covered by a in how many minuites?
Read Solution (Total 6)
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- let speeds of a,b,c be a,b,c respectively
given a=2b=6c
i.e., a will take 1/6 time the c takes
if c takes 3/2 hrs a will take (1/6)*(3/2)= 1/4 hrs. - 7 years agoHelpfull: Yes(8) No(0)
- 2a=b =>a=b/2
3b=c =>b=c/3
a=c/6
C=3/2hours
C=3/2*60=90min
a=90/6min
a=15min - 7 years agoHelpfull: Yes(4) No(0)
- a/b= (2/1)*3
b/c= 3/1
a:b:c= 6:2:1
T= 3/2*x/6x= 1/4 hrs - 7 years agoHelpfull: Yes(1) No(1)
- given,
2a=b:3b=c
c=3/2
now from 3b=c,
3b=3/2
b=3/6=1/2
now 2a=b
a=1/2*2=1/4hr
(1/4)*60=15min
a=15min - 7 years agoHelpfull: Yes(1) No(0)
- 15 min. Suppose speed of b be x m/min.
>implies speed of a is 2x m/min. and that of c be b/3 m/ min.
Distance=speed x time
Therefore b travels (x/3(3/2(*60)))=30 x
Total distance is 30x
For a ,time = distance/ speed
> 30x / 2x = 15 min. - 7 years agoHelpfull: Yes(1) No(0)
- 15 min
Speed of a=S1
Speed of b=S2
Speed of c=S3
S1=2*S2
S2=3*S3
S1=6*S3
Distance (D) covered by c =S3*3/2 hr
Then Distance (D) by a =S1*T hr
S1*T=S3*3/2
6*S3*T=S3*3/2
6*T=3/2
T=1/4 hr or 15 min - 7 years agoHelpfull: Yes(0) No(0)
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