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© examsnet.com
Question : 14
Total: 40
A train travels at a certain average speed for a distance of 63 km. Thereafter, it travels a distance of 72 km with an average speed of 6 km/hour more than the original speed. The total time taken to complete the journey is three hours. What is the original average speed of the train?
36 km/h
42 km/h
48 km/h
54 km/h
Validate
Solution:
Average speed
=
Total
distance
covered
Total
time
=
63
+
72
3
=
135
3
= 45 km/hr
Let the original speed = x km
Average speed then original speed = x + 6
Now
x
+
(
x
+
6
)
2
=
45
2
x
+
6
=
90
⇒
x
=
42
km/hour
© examsnet.com
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