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Q1
:
What is the speed of the boat in still water?
I.
The speed downstream is 12 kmph.
II.
The speed upstream is 4 kmph.
III.
In a to and fro journey between two points, the average speed of the boat was 6 kmph.
A
Any two of the three
B
All I, II and III
C
Any two of the three
D
I and II only
E
III, and either I or II
Solution
ANS:
D
- Any two of the three
From I and II, speed of boat in still water =
1
(12 + 4) km/hr = 8 km/hr.
2
From II and III, we get:
Using average speed =
2
x
y
, we get:
2 x 4 x
y
= 6
x
+
y
4 +
y
8
y
= 24 + 6
y
y
= 12.
Required speed =
1
(12 + 4) km/hr = 8 km/hr.
2
Similarly, I and III also give the answer.
Correct answer is (D).
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