Question
A is cycling at an average speed of 15 km/hr such that
he can reach a certain point at 12 noon. If he cycles at 30 km/hr, then he will reach the destination at 10 a.m. At what speed he should cycle to reach the destination at 11 a.m.Solution
ATQ, A reaches the destination at 12 noon at 15 km/hr and at 10 a.m. at 30 km/hr. Distance = 60 km (calculated using time difference of 2 hours). To reach at 11 a.m., A needs to take 3 hours. Required speed = (60 km/3hr) = 20 km/hr A should cycle at 20 km/hr to reach at 11 a.m.
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a. p is a perfect cube
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