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SSC CGL Tier-1 20-Aug-2021 Shift 1 Solved Paper
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© examsnet.com
Question : 58
Total: 100
A
takes
2
h
more than
B
to cover a distance of
40
k
m
. If
A
doubles his speed, he takes
1
1
2
h more than
B
to cover
80
k
m
. To cover a distance of
120
k
m
, how much time (in hours) will
B
take travelling at his same speed?
1
2
3
1
1
4
1
1
3
1
1
2
Validate
Solution:
Let speed of
A
is
x
k
m
∕
h
.
Speed of
B
is
y
k
m
∕
h
.
We know that, Speed
=
Distance
time
∵
Distance
=
40
k
m
Time difference
=
2
h
According to the question,
40
x
−
40
y
=
2
. . . (i)
A speed is double and distance is
80
k
m
Then,
80
2
x
−
80
y
=
3
2
. . . (ii)
Subtracting Eq. (i) by Eq. (ii),
⇒
40
x
−
40
y
−
40
x
+
80
y
=
2
−
3
2
=
(
4
−
3
)
2
⇒
40
y
=
1
2
⇒
y
=
80
k
m
∕
h
=
Speed of
B
Now, to cover
120
k
m
speed at
80
k
m
∕
h
.
Time
=
120
80
=
3
2
=
1
1
2
h
© examsnet.com
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