Question

A plane travels from point A for 1 hour the west at 400km/h and then travels towards the north for 1 hour at 300km/h arriving at point B. A second plane,starting at A at B same time as the first plane if its speed is . iss ka anser hai 250km/h.
A.100km/h
B.250km/h
C.500km/h
D.700km/h ​

Answer 1

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

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

Answer 2

             →S O L U T I O N ←

=========================

Given :

Distance travelled in first one hour from

point A = 400 km

Distance travelled in next one hours

to reach point B = 300 km

=========================

To find :

Required speed

=========================

Firstly we have to find distance between

A B

So,

⇒AB² = 400² + 300²

⇒AB² = 160000 + 90000

⇒AB² = 250000

⇒AB = √250000

∴ AB = 500 km

=========================

Now,

 According to the question

 second plane have to travel

 500 km in 2 hours

We know that

Speed = $\dfrac{Distance}{time}$

∴$Speed=\dfrac{500}{2}\\\\\boxed{Speed=250\:km/h}$

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A.100km/h

B.250km/h  ✔

C.500km/h

D.700km/h ​

∴ OPTION B IS CORRECT