math...?

to save fuel on the 240 km trip to the cottage, the Nakamura family reduce their usual average speed by 20 km/h. this lengthens their journey by 1 hour. what is the slower average speed?

i was told this question is not complete to answer? is that true?

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  1. normal speed ---- x km/h
    time at normal speed = 240/x hours

    reduced speed --- x-20 km/h
    time at reduced speed = 240/(x-20)

    solve:
    240/(x-20) - 240/x =1

    hint: multiply each term by x(x-2)

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