Answers

2016-03-06T16:41:18+05:30
Answer is 30 minutes....



Solution...
 
Let original speed be x and original time taken be t
let d be the distance 
 
Speed = d/t
x=d/t

if speed be 2x/3 time will be t+15


2x/3 = d/(t+15)
2(d/t)/3 = d/(t-+15)
2/3t = 1/(t+15)

Cross multiply

2(t+15) = 3t
2t+30 = 3t
3t-2t = 30
 
t = 30..............(answer)

Hope it is correct

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