Question

The Shatabdi express from Pune to Delhi was delayed by snowfall for 18 minutes and made up for the delay on a section of 60 km travelling with a speed of 10 km per hour higher than its normal speed. Find the original speed of the Shatabdi express(according to the schedule).

A 60 km/h
B 66 km/h
C 50 km/h
D 40 km/h
E None of these
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