A certain distance is covered in 50 min with a speed of 60 km/h. How much extra time will be needed, if the distance is kept same and the speed is halved?
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Answer: Let the speed, distance and time be s,d and t
S=d/t
S1=(d/2)/2t
S1=d/4t
S/S1=(d/t)/(d/4t)
S/S1=4/1
S:S1=4.1
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