Question

Rohit covered a distance of 350 km in 5 hrs by his car .if part of distance covered was the speed of 60 km /hr and rest at 80 km/hr. For how many hours did he travelled at 80 km/ hr

Answer 1

Answer:

Step-by-step explanation:

let x be for 80 km/hr and y be for 60 km/hr.

given that, his car has traveled partly 60 km/hr and 80 km/hr.

we know speed x time =distance. according to the question,

• 80x + 60y=350. first equation .

time taken by both the speeds is x and y.so,

• x+y=5. second equation.

now if we solve by substitution method ,

we get x as 2.5 hours.