Question

A bus a bus stand a distance of 350 km from a to b with the average speed of 75 km / hour how many how will the bus take cover to distance from a to b ​

Answer 1

Answer:

$let \: original \: speed \: be \: v \\ \now \: \frac{75}{v} + \frac{90}{v} + 10 \\ = 3 \\ = 25(v + 10) + 30v = v(v + 10) \\ = v2 - 45v - 250 = 0 \\ = (v + 5)(v - 50) = 0 \\ so.v = 50km \: or \: hr \: as \: speed \: cannot \: be \: in \: negative$

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