One third of a certain journey is covered at the speed of 80 km/hr on…

Question

One third of a certain journey is covered at the speed of 80 km/hr one fourth of the journey at the speed of 50 km/hr and the rest at the speed of 100 km/hr what will be the average speed (in km/hr) for the whole journe…

Accepted Answer

Option A. 75. Answer & Solution Answer: Option A Solution: & Average speed = Total Journey Time Taken & Remaining distance & = 1 - ( 1/3 + 1/4 ) = 512 km & Average speed & = 1 13 × 80 + 150 × 4 + 1 × 5100 × 12 & = 1 5 + 6 + 51200 & = 120016 & = 75 km/hr .

One third of a certain journey is covered at the speed of 80 km/hr one fourth of the journey at the speed of 50 km/hr and the rest at the speed of 100 km/hr what will be the average speed (in km/hr) for the whole journey?

Solution