Question
A man reaches his destination in 6 hours at his usual
speed. If his speed is reduced by (1/4), he travels 30 km less in the same time. What is his usual speed?Solution
ATQ, Let the usual speed be 4x km/h. The reduced speed = (3/4) × 4x = 3x km/h Using the formula Distance = Speed × Time, 
Usual speed = 4x = 20 km/h.
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