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One third part of a certain journey is covered at the speed of 10 km/hr, one fourth part at the speed of 15 km/hr and the rest part at the speed of 20 km/hr. What will be the average speed for the whole journey?

 

[SSC CHSL 16th March 2023 Shift-1 With Answers]
A
B
C
D

EXPLANATION

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