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This is a distance speed time question.

   Time    Speed   Distance 
  6 30.9 3.06
       

a)

Distance = 3 km + 50 m + 60 m = 3.11 km

T = 3.11 ÷ 30.9 × 60 = 6.03  min = 6 min

23h 56 min + 6 min = 1 day 0 hr 2 min = 00 02 hrs

b)

Distance = 6 km + 60 m = 6.06 km

Speed = 6.06 ÷ ( 6 /60) = 60.6 km / h

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