Maths

A student cycles for xhours at 12km/hr and y hours at 16km/hr.Altogether,the student cycles 66km/hr in 5hrs.find the values of x and y

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  1. The way you typed it makes no sense.
    Did you mean he biked 66 km in 5 hrs ?

    I will assume that.

    distance covered at 12 km/h = 12x km
    distance covered at 16 km/h = 16y km

    12x + 16y = 66
    6x + 8y = 33

    x + y = 5
    y = 5-x

    plug this into the other equation:
    6x + 8(5-x) = 33
    6x + 40 - 8x = 33
    -2x = -7
    x = 3.5
    then y = 1.5

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  2. how is y =1.5

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  3. how did y become 1.5

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