Question 523010
A driver on a highway journey of 50 km travels the first 30 km in exactly 20 minutes and completes the rest of the journey at a constant speed of 100 kmph.
find the average speed of the driver in first 30 km.
:
Speed = dist/time
change 20 min to {{{1/3}}} hr
s = {{{30/(1/3)}}}
s = 30 * 3
s = 90 km/h