Mica covers a distance in 20 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 40%.  Choose the most appropriate option
A) 50 km/h  B) 90 km/h  C) 75 km/h  D) 80 km/h  E) 100 km/h
Given Speed = 60 Kmph.   It means Mica covered 60 km in 60 min (1 hour). So, in 20 min he will cover 20 km.   40% time reduced = 20 - 40% of 20= 12 min.   Thus, Mica needs to cover 20 km in 12 min (0.2 hour).   Speed * Time = Distance.   Speed * 0.2 = 20   Speed = 100 kmph.   ANSW100 km/hR : OPTION 100 km/h
<result>E</result>
Mica covers a distance in 20 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 40%.