Heena 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 60%. Choose the correct choice
A) 60 km/h	B) 140.48km/h	C) 100 km/h	D) 148.14 km/h	E) 85 km/h
Given Speed = 60 Kmph.   It means Heena covered 60 km in 60 min (1 hour). So, in 40 min he will cover 40 km.   60% time reduced = 40 - 60% of 40 = 16min.   Thus, Heena needs to cover 40 km in 16 min (0.27 hour).   Speed * Time = Distance.   Speed * 0.27 = 40   Speed = 148.14 kmph.   ANSWER : OPTION 148.14 km/h
<result>D</result>
Heena 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 60%.