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UPSC CDS 1 2020 Math Paper
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© examsnet.com
Question : 28
Total: 100
The ratio of speeds of X and Y is 5 : 6. If Y allows X a start of 70 m in a 1 -2 km race, then who will win the race and by what distance ?
X wins the race by 30 m
Y wins the race by 90 m
Y wins the race by 130 m
The race finishes in a dead heat
Validate
Solution:
👈: Video Solution
Let us assume that speed of x = 5 m/s
∴ speed of y = 6 m/s
t
y
=
1200
6
=
200
sec
t
x
=
1200
−
70
5
=
1130
5
=
226
sec
So y wins the race by 26 sec.
26 sec for
x
=
26
×
5
=
130
m
© examsnet.com
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