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Time taken for first 40 km = Distance / Speed = 40 / 60 = 2/3 hours. Time taken for next 60 km = 60 / 90 = 2/3 hours. Total distance = 40 + 60 = 100 km. Total time = 2/3 + 2/3 = 4/3 hours. Average speed = Total distance / Total time = 100 / (4/3) = 75 km/h. Answer: b) 75 km/h.
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31.5 ÷ 1.75 × 6 – 12 = ? + 34
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The height of a right circular cone is 7 cm, and its volume is 733(1/3) cm³. Determine the diameter of the cone.
24.5% of 400 + 528 of 12.5 ÷ 11
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