Question : Mohan completed a certain journey by car. If he covered 30% of the distance at 90 km/hr, 45% of the distance at 135 km/hr, and the remaining distance at 75 km/hr. His average speed (in km/hr) for the entire journey is:
Option 1: 100
Option 2: 90
Option 3: 105
Option 4: 95
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Correct Answer: 100
Solution :
Let the total distance travelled by Mohan =
30% of distance =
45% of distance =
Remaining distance = (
According to the question,
=
=
=
Average speed =
Hence, the correct answer is 100.
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