self Maths Puzzle

A balloon propelled by some mechanical device travels five miles in ten minutes with the wind, but requires one hour to go back again to the starting point against the wind, how long would it have taken to go the whole ten miles in a calm, without any wind?

Read Solution (Total 1)

let ballon travells at= y mmin.
wind speed = x m/min
when in same directn= x+y = 5mile/10min = 0.5 m/min.

in opp. directn of wind= x-y = 5mile/60 min. = 0.083 m/min.

so by cal. x=0.291 m/min
y = 0.208 m/min

10 miles will be covered in= 10/0.208= 48.07 min approx
12 years agoHelpfull: Yes(0) No(0)

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