Question 988319
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x=original speed
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2.5x=2(x+3km/hr)
2.5x=2x+6km/hr
0.5x=6km/hr
x=12km/hr
ANSWER: The original speed was 12 km/hr. 
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CHECK:
2.5hr(12km/hr)=2hr(12km/hr+3km/hr)
30km=2hr(15km/hr)
30km=30km