Elitmus Exam

in a 100 meter race. a can beat by 10 meters and c by 19 meters. in a race of 180 meters b will beat c by how many meters?
option
a)20meter
b)13meter
c)16meter
d)15meter
e)none of these

Read Solution (Total 2)

probably he wants to say that a beats b by 10 m, assuming that , let time taken by a to complete the race be x sec so speed of a = 100/x m/s
speed of b= 90/x m/s , speed of c=81/x m/s
now in 180 m race b will complete the race in 180x/90 = 2x sec
and in 2x sec c an reach (81*2x)/x = 162 m
so b can beat c by 18 m . i.e e) none of these could b the answer
11 years agoHelpfull: Yes(12) No(0)

In the given Question A beats B by 10m.
Therefore A run 100m Then B run 90m
Ratio of A and B Speed is 100:90
Similarly Ratio of the Speed of A and C is 100:81

Therefore Ratio of speed of B and C is 90/100 * 100/81 = 10:9
when B run 180m then C run = ( 9/10 ) * 180 = 162m
Therefore B beat C by 180 - 162 = 18m
So Answer is None of this.
7 years agoHelpfull: Yes(0) No(0)

Elitmus Other Question

a number when divided by 39 leaves a remainder 20. what is the remainder when the same number. divided by 13?
option
a)7
b)12
c)8
d)10
e)none A contribute rs.1500 and B rs.900 in a business. A is sleeping partner and B gets 10% of the profit for managing the business and the rest of the profit is divided in proportion of their capitals. if the profit is rs.800 what is the share of B?
option
a)none
b)420
c)300
d)350
e)270