A man travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20km/hr, and the last one-third distance with a speed of 60 km/hr. The average speed of the man for the whole journey is?

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A man travels the first one-third of a certain distance with a speed of 10 km/hr, the next one-third distance with a speed of 20km/hr, and the last one-third distance with a speed of 60 km/hr. The average speed of the man for the whole journey is?

A18 km/hr

B24 km/hr

C27 km/hr

D15 km/hr

Answer:

A. 18 km/hr

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ഒരേ നീളമുള്ള രണ്ട് ട്രെയിനുകൾ യഥാക്രമം മണിക്കൂറിൽ 46 കിലോമീറ്ററും മണിക്കൂറിൽ 36 കിലോമീറ്ററും വേഗതയിൽ ഒരേ ദിശയിലേക്ക് നീങ്ങുന്നു. വേഗതയേറിയ ട്രെയിൻ 36 സെക്കൻഡിനുള്ളിൽ വേഗത കുറഞ്ഞ ട്രെയിനിനെ മറികടക്കുന്നു. ഓരോ ട്രെയിനിന്റെയും നീളം എത്രയാണ്?