Question

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Answer 1

Step-by-step explanation:

Let the speed of the bicycle be x km/hr

Acc to the condition

$\frac{48}{x} - \frac{48}{x + 4} = 1$

$48( \frac{1}{x} - \frac{1}{x + 4} ) = 1$

$\frac{x + 4 - x}{x(x + 4)} = \frac{1}{48}$

$\frac{4}{x(x + 4)} = \frac{1}{48}$

$192 = {x}^{2} + 4x$

${x}^{2} + 4x - 192 = 0$

$(x + 16)(x - 12) = 0$

$x = - 16 \: or \: 12$

Since speed can't be negative,

Therefore x = 12