A lorry averages 55mph for the first 4 hours of a trip and
averages 70 mph for each additional hour. The average
speed for entire trip was 60 mph. How many hours long is
the trip?
a)14 b)12 c)11 d)8 e)6
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Answer / monu jain
answer is 6 hours and 360 miles
55*4 = 220 miles
and as the average speed is 60 then the total distance
should be multiple of 60 only
each additional hour has a average of 70 means we will add
70 in 220 till multiple of 60 is not coming
then 220+70 = 290/6 =48.3 not multiple
then 220+70+70 = 360/6 = 60 multiple
means total distance is of 360 kms and by average speed of
60 it will consume 360/60 = 6 hours
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