a bus covers a certain distance in 3 hour 20 minutes at the average speed of 45 km per hour how long will it take to cover the same distance at a speed of 36 km per hour.
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3hrs 20 mins = 3 1/3 hour.
speed = 45km/h.
∴distance=45×10/3
=15×10=150km.
Now speed = 36km/h.
distance=150km.
∴time= 150/36
=25/6
= 4hrs and 10 mins.
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