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RRB Group D 17-Sep-2018 Shift 1 Solved Paper
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© examsnet.com
Question : 11
Total: 100
A man travels by train and car to reach his office.
If he travels by car for 10 km and the remaining by train, he reaches office in
t
hours. Doing exactly the opposite, he reaches office in (t+ 0.5)hours. If the speed of the train and the car are 50 km/h and 40 km/h, respectively, find the distance he travels to reach his office.
80 km
140 km
100 km
120 km
Validate
Solution:
Let the distance travelled by train
=
x
km
then
10
40
+
x
50
=
t
........ (i)
also
10
50
+
x
40
=
t
+
0.5
.........(ii)
Substituting value of eqn (1) in eqn (2) we get
10
50
+
x
40
=
10
40
+
x
50
+
0.5
40
+
5
x
−
50
−
4
x
=
100
⇒
x
−
10
=
100
⇒
x
=
110
∴
distance travelled
=
x
+
10
=
110
+
10
=
120
km
© examsnet.com
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