priya' s mother started walking from her house at 8 o' clock and reached office at quarter to 10 .how long did she take to reache office?
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Answer (c).
Let half of the distance travelled be d.
Time taken at the speed of 4 km/hr = (d/4)
Time taken at the speed of 5 km/hr = (d/5)
Therefore, total time = (d/4) + (d/5) = 9 hrs.
⇒ (5d + 4d)/20 = 9
⇒ 9d = 180
⇒ d = 20.
Therefore total distance = d x 2 = 40 kms
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