Sujal covers a distance in $40$ min, if she drives at a speed of $60$ km/h on an average . Find the speed at which she must drive at to reduce the time of the journey by $25\%$.

A 25% reduction in the 40 minute travel time reduces it by 10 minutes, making the new time 30 minutes, or 0.5 hours. Using the formula distance equals speed multiplied by time, the distance is 60 km/h multiplied by 2/3 hours, which equals 40 km. Dividing this distance by the new time of 0.5 hours gives a required speed of 80 km/h.

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