Question
A train was initially moving at 60 km/hr, then increased
its speed by 15 km/hr after ‘z’ hours and continued for (z + 8) hours more. If the distance covered in the last (z + 8) hours is 900 km, find the distance covered in the first ‘z’ hours.Solution
ATQ, (60 + 15) × (z + 8) = 900 Or, 75 × (z + 8) = 900 Or, z + 8 = 12 Or, z = 4 Therefore, required distance traveled = 60 × 4 = 240 km
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