A person travels from A to B at 75kmph in a car and in the return journey the speed is reduced by 15kmph.If the total time taken is four-half- hours then the distance in kms between A and B
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given s1=75kmph
reduced 15kmph s2 =60kmph
avg speed = 2xy/x+y
2×75×60/75+60
150×60/135
10×60/9
600/9
200/3
speed=200/3
time= 4.5hrs
speed=distance/time
distance=speed×time
distance=200/3×9/2
d=100×3=300kms is answer
reduced 15kmph s2 =60kmph
avg speed = 2xy/x+y
2×75×60/75+60
150×60/135
10×60/9
600/9
200/3
speed=200/3
time= 4.5hrs
speed=distance/time
distance=speed×time
distance=200/3×9/2
d=100×3=300kms is answer
dinah65:
answer given 150 in key
total distance 150 for going and 150 for returning so 300 is answer
if it's only in 1 direction 150 will be answer
okay so.. actually distance is 150
between A and B
yes if it's only between a and b 150 will be answer
thank you..so much
OK friend
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