Q262
Mary jogs 9 km 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 ?
A.
9 kmph
B.
10 kmph
C.
12 kmph
AnswerD.
14 kmph
Answer: Option C
Solution
Answer: Option C
Solution:
Let speed of jogging be x km/hrTotal time taken :
Total distance covered =