in a journey of 450km a person complete its 150km in 3hours.Then he increases his speed by 20%.How long time does it take to complete all the journey
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Approx 8 hrs time needed to complete
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Given:
Total distance of the journey = 450 km
The person completes 150 km in time = 3 hours
To find:
How long does the person take to complete the journey when he increases the speed by 20%?
Solution:
Distance left to be covered = 450 - 150 = 300 km
Speed of the person in the first 3 hours = Distance covered/ time = 150/3 = 50 km/hr
When the speed increases by 20%, new speed = 50 + (20/100)*50
=50 + 10 = 60 km/hr
Time taken to complete rest of the journey with a speed of 60 km/hr = Distance/ velocity
= 300/60 = 5 hrs.
Therefore the time required will be 5 hrs.
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