# Ex 13.2, 9 - Chapter 13 Class 8 Direct and Inverse Proportions

Last updated at Nov. 12, 2018 by Teachoo

Last updated at Nov. 12, 2018 by Teachoo

Ex 13.2, 9 A car takes 2 hours to reach a destination by travelling at the speed of 60 km/h. How long will it take when the car travels at the speed of 80 km/h? Given, If speed is 60 km/h, then car takes 2 hours to reach the destination. We need to find how long will it take to reach the destination if speed is 80 km/h Let the time taken by car be π¦ hours Thus, our table looks like As we increase the speed of car the time taken to reach the destination reduces (as the Distance remains the same) β΄ They are in inverse proportion 60 Γ 2 = 80 Γ π¦ (60 Γ 2)/80 = π¦ 3/2 = π¦ π¦ = 3/2 hours π¦ = 11/2 hours β΄ Car will take π π/π hours to reach the destination