The distance-time graph of X, Y and Z in a race is given below. Find the winner by analysing the graph.

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Solution

The correct option is A X
Slope of distance-time graph gives speed.
More steeper the slope, more is the speed.
Therefore, X is moving with a greater speed and hence X will be the winner.

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C - H

Question 20
If y is the reciprocal of rational number x, then the reciprocal of y will be
(a) x
(b) y
(c) $\frac{x}{y}$
(d) $\frac{y}{x}$

\frac{y + z}{a} = \frac{z + x}{b} = \frac{x + y}{c}

\frac{x}{b + c - a} = \frac{y}{c + a - b} = \frac{z}{a + b - c}

|\begin{matrix} a & b - y & c - z \\ a - x & b & c - z \\ a - x & b - y & c \end{matrix}| =

\frac{a}{x} + \frac{b}{y} + \frac{c}{z}

x, y, z \neq

X, Y, Z

J

X = 2, 8, 4

Y = 2, 8, 8

Z = 2, 8, 8, 1

J = 2, 8, 8, 7

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