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02 Dec 2021, 08:00
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
73% (02:18) correct
27%
(02:40)
wrong
based on 278
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Sam covers a total distance of 80km while travelling from a certain point X to a certain point Y and come back again to the start point X. He covers the first 40 km distance from point X to point Y at a speed of 25 km/hr. While travelling back to the point X from point Y, Sam drives his vehicle at a speed of 15 km/hr. Calculate the approximate average speed of Sam for the entire journey.
A. 20.77 km/hr
B. 18.77 km/hr
C. 35.77 km/hr
D. 17.77 km/hr
E. None of the above
A. 20.77 km/hr
B. 18.77 km/hr
C. 35.77 km/hr
D. 17.77 km/hr
E. None of the above
02 Dec 2021, 08:13
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Bunuel
Time taken in the to and fro journey is \(\frac{40}{25} + \frac{40}{15} = \frac{64}{15}\)
Total distance is 80
So, Average speed will be \(80*\frac{15}{64} = 18.77\), Answer will be (B)
02 Dec 2021, 08:54
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total distance is 80 km
and distance from X to Y = 40 km and same on return
so avg speed = 2*25*15 / ( 25+15) ; 750/40 ; 18.75
option B
and distance from X to Y = 40 km and same on return
so avg speed = 2*25*15 / ( 25+15) ; 750/40 ; 18.75
option B
Bunuel
