Question

By increasing the speed of her car  by 5 km/h, Alice was able to drive 12 km in 0.2 hours.  What was her original speed?

Answer 1

Alice's driving speed = distance driven / time taken
= 12 km / 0.2 hours = 60 km per hour = 60 kmph

She increased the speed by 5 kmph and then it became 60 kmph

So her speed earlier was less by 5 kmph
= 60 kmph - 5 kmph = 55 kmph

Answer 2

`v=(s)/(t)\\\\v-speed\\s-distance\\t-time\\\\s=12km;\ t=0.2h\\\\v=(12)/(0.2)\ km/h=(120)/(2)\ km/h=60\ km/h\\\\60\ km/h-5\ km/h=55\ km/h\\\\Answer:Her\ original\ speed\ was\ 55\ km/h.`