Question

an athlete covers a certain distance in 30 minutes at the uniform speed of 12km/hr. bye How must he must increase hid speed so as to cover the same distance five minutes early?

Answer 1

Find the distance :

Distance = Speed x time

Distance = 12 x 30/60

Distance = 6 km

Find the Speed needed:

Time needed = 30 - 5 = 25 min = 25/60 hour

Speed = Distance ÷ Time

Speed = 6 ÷ 25/60 = 14.4 km/h

Difference in speed:

increase = 14.4 - 12 = 2.4 km/h

Answer: He must increase his speed by 2.4 km/h

Answer 2

here is your answer OK dude

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best method to solve OK..........

Distance = Speed x Time

So Distance covered = 12 Km/Hr * 0.5 Hr = 6 Km

To cover the same distance 5 minutes earlier = 25 minutes or 0.416667 Hour

So Speed required = 6km/0.416667Hr = 14.3999 Kmph or 14.4 Kmph

So, the athlete should increase his speed by 2.4 kmph


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