Question

Q: A plane travels form A point for 1hour towards the west at 400km/h and then travel towards the north for 1hour at 300km/h arriving At point B.A secomd plane starting at A at the same time as the first plane as travelling towards B along A staright line will arrive at B at the same time as that first plane if its speed is?<br />(A)250km/h<br />(B)700km/h <br />(C)100km/h<br />(D)1200km/h<br />(E)500km/h<br />PLZZZ tell me with solution<br />
plzzzzzzz tell meeeee fastttttttt

Answer 1

500km is the answer

Answer 2

solution:

Here, Distance travel in one hour from point A with seed of 400km/h = 400km

And, distance travel in next one hour to reach point B with speed of 300km/h = 300km

Now, Distance between AB

${ab}^{2} = {400}^{2} + {300}^{2} \\ ab = \sqrt{250000 } \\ ab \: = \: 500$
Thus, AB = 500km

Now, second plane has to travel 500km in 2 hours

so, required speed= 500/2 = 250km/h

So, correct option is (A) 250km/h
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Amrit