A train covers first 50 km of it's journey at the speed of 75 km/hr , next 90 km at 80 km/hr and rest of it's 240 km at a speed of 120 km/hr . Find the time taken to complete the journey . Also find the average speed
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time taken in 1st part,t₁ =dist./speed=50/75=2/3
time taken in 2nd part,t₂ = 90/80 = 9/8
time taken in 3rd part,t₃ = 240/120 = 2
∴ total time taken =2/3 + 9/8 + 2=(16+27+48)/24
= 91/24 =3.79 hrs.
Now, avg. speed = (75+80+120)/3 = 275/3
= 91.61 km/hr
hope it helps .........
time taken in 2nd part,t₂ = 90/80 = 9/8
time taken in 3rd part,t₃ = 240/120 = 2
∴ total time taken =2/3 + 9/8 + 2=(16+27+48)/24
= 91/24 =3.79 hrs.
Now, avg. speed = (75+80+120)/3 = 275/3
= 91.61 km/hr
hope it helps .........
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