A train moves with a speed of 30 km | hr for 12 minutes and for next 8 minutes at a speed of 45 km/hr. The average speed of the train is:
Answer: 36 km/hr
Explanation
36km/hr
Distance= Speed × Time
Distance covered by the train with the
speed of 30 kmph in 12 minutes is
= 30 × 12/60 = 6km
Distance covered by the same train with the speed of 45kmph in 8 minutes is
=45 × 8/60 = 6km
Average speed
= total distance/ total time.
(6 + 6) km / (12 + 8) min = 12/20 × 60
= 36kmph
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