Question

A plane takes 2 hours and 45 minutes to cover the distance between two airports. If it
travels 20 km/h slower then it takes 3 hours. Find the speed of the plane. Also, find the
distance between the two airports.​

Answer 1

let the original speed be x

time taken =2hr 45 min =165/60 hr

distance =s*t=165x /60 km

if the speed is 20 km per hour less

new speed =x-20

time taken =3 hours

distance =3*(x-20)

ATQ,

3 (x-20) = 165×160

x=240 km/hr

distance = 660 km