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Answer:
Let k be any random constant
i) directly (for a constant speed=distance/time=constant
distance=k×time)
ii) inversely (for a fixed distance covered speed×time=distance=k , therefore speed =k/time)
iii)36×5/18=10 m/s
(1 km/h= 1000m/(60×60 s)=5/18 m/s)
iv) 2/5=x/15 so x=2/5×15= 6
v) 1:2:3