Question

Q.1.
An aeroplane goes from country A to country B with an average speed of 45 kmh-¹ and returns with an average speed of 300 kmh-¹. Find the distance between the two countries if the flight takes 15 hours in all.
Q 2.
Find the distance covered (in km) by a bike in 4 minutes at the speed of 63 kmh-¹.​

Answer 1

Answer:

Q2 time =4 min or 4/60=1/15 hour

speed=63

distemce=s*t . 1/15*63= 4.2

ans 4.2km

Answer 2

Answer:

Let d be the distance between A and B

Let

t1 be time to go from A to B

Then t1 =d/450

Let t2 be time to go back from B to A

Then t2=d/300

t1 + t2=d(1 /450+1/300)=15

After simplify you will find d= 2700km