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MATHEMATICS

JAMB 2023 - Question 33

Mathematics 2023 JAMB Past Questions - Question 33: A man runs a distance of 19km at a constant speed for the first 4km and then 2km/h faster for the rest of the distance. The whole run takes him 1 hour. His average speed for the first 4km is

A man runs a distance of 19km at a constant speed for the first 4km and then 2km/h faster for the rest of the distance. The whole run takes him 1 hour. His average speed for the first 4km is

A: 6km/h

B: 13km/h

C: 8Km/h

D: 9km/h

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Correct Answer

Explanation

Distance = 19kmTime = 1 hr80mSpeed for 5km is 2km/hr.Time = 5/2 hrSpeed for 1st 4km = 20 x 4 = 8km/hr.