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.

A 240 km
B 200 km
C 275 km
D 250 km
E None of these
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