Question

Bina has to travel a distance of 1620 km. She travels 1200 km by an aeroplane at 800 kn
300 km by car at a speed of 60 km/h and the remaining distance at 48 km/h by bus.Calculate a. the time taken by plane car and bus, b. the average speed of the journey.​

Answer 1

Answer:

180 km/hr

Step-by-step explanation:

1200 km by aeroplane:

⇒ speed = distance/time

⇒ time = distance/speed

          = 1200/800 =  1.5 hr

Similarly, 'when by car':

⇒ time = 300/60 = 5 hr

  Remaining dist. = 1620 - 1200 - 300

                              = 120 km

             When by bus:

⇒ time = 120/48 = 2.5 hr

      Total distance = 1620

Total time = 1.5 + 5 + 2.5 = 9hr

Hence,

Average speed = 1620/9 = 180 km/hr