Question
Average speed of 28 vehicles is 60 km/h. Two new vehicles
join with speeds (s + 15) and (s - 5), and the average becomes 62 km/h. Find (s - 45).Solution
30 × 62 − 28 × 60 = s + 15 + s − 5
2s + 10 = 1860 − 1680 = 180
2s = 170
s = 85
s − 45 = 85 – 45 = 40
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