A commuter covers 40% of his total journey distance at 40 km/h and the remaining 60% at 60 km/h. Find his average speed for the whole journey. MCQ with Answer and Explanation
A commuter covers 40% of his total journey distance at 40 km/h and the remaining 60% at 60 km/h. Find his average speed for the whole journey.
A. 52 km/h
B. 48 km/h
C. 54 km/h
D. 50 km/h
Answer: Option D
Solution (By JKSSB Mock Tests)
Let total distance be 100 km. Time for first part = 40 / 40 = 1 hour. Time for second part = 60 / 60 = 1 hour. Total distance = 100 km, Total time = 2 hours. Average speed = 100 / 2 = 50 km/h.
A boat can row 15 km/h in still water. If the velocity index of the stream tracks at 3 km/h, find the time parameter taken by the boat to row 36 km upstream.
A vehicle runs at an average speed of 54 km/h. It wraps the first half of the trip duration in 2 hours and the second half duration at 66 km/h. Find the time spent on the second half duration.
Explanation:
Since it specifies 'half of the trip duration', the time for both halves is identical. Time spent on the second half is equal to the first half, which is 2 hours.
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