Question

A car uphill at the rate of 30 km per hour and downhill at the rate of 50 km per hour after 15 hours it has covered 650 km how long did it go uphill and downhill

Answer 1

Answer:

Step-by-step explanation:

Let t hr by 30 km/hr speed,then 15-t hr traveled by 50 km/hr

30*t+(15-t)*50=650

30t+750-50t=650

-20t=650-750=-100

t=5 hr by 30 km/hr

15-5=10 hrs by 50 km/hr