Question

Doon Express took 26 hours 37 minutes 10 second in travelling from Dehradun to Delhi during this time the train had a total stoppage of 8 hours 49 minutes 45 seconds at different stations from how much time was the train moving

Answer 1

Answer:

Your answer is like this

Step-by-step explanation:

kab+2a²-b²=(a-b)(2a+b),

kab+2a²-b²=2a²+ab-2ab-b²,

kab=-ab,

then

k = -ab/ab,

k=-1

Hence the valuea of k = -1