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Aptitude
Two straight lines can divide a circular disk into a maximum of 4 parts. Likewise into how many parts can four straight lines divide a circular disk ?
A) 8
B) 9
C) 10
D) 11
Correct Answer:
A) 8
Description for Correct answer:
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1). A person can row a boat d km upstream and the same distance downstream in \( \Large 5 \frac{1}{4} \ hours \). Also he can row the boat 2d km upstream in 7 hours. He will row the same distance downstream in
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B). \( \Large 3 \frac{1}{4} \ hours \)
C). \( \Large 4 \frac{1}{4} \ hours \)
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2). The rate at which a river flows is one-third the speed of a boat in still water. If that boat travels down the river for 2 hours and then back up river for 2 hours, it will be 16 km short of its starting point. The speed (km/hour) of the boat in still water is
A). 4
B). 6
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3). If \( \Large a^{x} = b^{y} = c{z} \) and \( \Large \frac{b}{a} = \frac{c}{b} \) then \( \Large \frac{2z}{x + z} = ? \)
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5). For what value(s) of k, the roots of the equation \( \Large 9x^{2} + 2Kx + 4 = 0 \) will be equal ?
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9). A boat can travel 12.6 km downstream in 35 minutes. If the speed of the water current is \( \Large \frac{1}{4} \)th the speed of the boat in still water, what distance (in km) can the boat travel upstream in 28 minutes ?
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