A car did a journey in t hours. Had the average speed been x

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A car did a journey in t hours. Had the average speed been x kmph greater, the journey would have taken y hours less. How long was the journey?

[CDS II 2020 Mathematics Past paper]

x (t – y)ty

x (t – y)ty^–1

x (t – y)th^–2

x (t + y)ty