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Suggested answer:

R’s speed is 30m/min faster than G

30m/min x 40min = 1200m

After 40 min (at 8am) R travelled 1200m more.

1/6 of the journey =>1200m

5/6 of the journey => 1200m x 5 = 6000m

G’s speed will be,

6000m / 40 min = 150m/min

1200m / 150m/min = 8 min.

a) George will complete the race at 8.08am

(1200m + 6000m) /40min = 180m/min

b) Raja’s speed is 180m/min

 

 

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