Question : A man covers half part of a certain distance at 60 km/hr. He covers 40% of the remaining distance at the speed of 12 km/hr and covers the rest of the distance at the speed of 18 km/hr. What is his average speed for the entire journey?
Option 1: 24 km/hr
Option 2:
Option 3: 36 km/hr
Option 4: 40 km/hr
Correct Answer: 24 km/hr
Solution :
Let the total distance be 100 km.
Half distance =
Speed = 60 km/hr
Time taken to cover half the distance =
Remaining distance = 50 km
Distance = 40% of the remaining distance =
Speed = 12 km/hr
Time taken to cover 40% of the remaining distance =
Distance = 60% of the remaining distance =
Speed = 18 km/hr
Time taken to cover 60% of the remaining distance =
Average speed =
=
=
= 24 km/hr
Hence, the correct answer is 24 km/hr.
