An express train travelled at an average speed of 100 km/hr, slopping for 3 minutes after every 75 km. How long did it take to reach its destination 600 km from the starting point ?

A 6 hrs 21 min
B 6 hrs 24 min
C 6 hrs 27 min
D 6 hrs 30 min

Correct Answer: 6 hrs 21 min

The train travels 100 km in 1 hr the train travels 1 km in 1/100 hr the train travels 75 km in ( 75×1)/100 = (75×60)/100 = 45 minutes To travel 600 km it takes 600/75 = 8 steps On its way it stop in 7 steps On its way it stop waste ( 3×7) mints = 21 steps So total time = (45×8) + 21 minta = (360 + 21) mints = 6 hr 21 mints
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