Question
Mary jogs 9 kg at a speed of 6 km per hour. At what speed would she need to jog during the next 1.5 hours to have an average of 9 km per hour for the entire jogging session ?
Answer: Option C
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Let speed of jogging be `x` km/hr.
Total time taken = `(9/6 hrs + 1.5 hrs)` = 3 hrs.
Total distance covered = `(9 + 1.5x`) km
`:.` ` (9 + 1.5 x)/(3)` = 9
`hArr 9 + 1.5 x = 27 hArr 3/2 x = 18 hArr x(18 xx 2/3)` = 12 kmph.
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