How many ways are there to arrange 7 distinct red and 5 distinct blue balls in a row such that:?
1 answer:
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Let the rate of walking in the evening be = x km/h
As Ed wants to walk at a rate if 1 km/h more in the morning, then rate in morning becomes = x+1 km/h
So, distance is 12 km, speed is x+1 km/h
Total time is = 5 h 24 m or convert it into hours, it becomes 5.4 hours
Time in morning becomes =
Time in evening becomes =
So equation becomes=
Solving this quadratic equation, we get, x= -5/9 or x=4
As X cannot be negative so neglect -5/9.
Solving by using x=4, we get rate as x= 4+1 =5 km/h
Hence, rate in the morning is 5 km/h.