a city is a is connected with the city b through an 80 km long Highway A car starts at - Science - Motion

Question

a city is a is connected with the city b through an 80 km long
Highway A car starts at a uniform speed of 40 km/ per hour from
City a to towards city B and covers half of the journey with this
speed how fast must the car travel for the next 40 kilometres so
that its average speed for the entire journey is 50 km per hour?

Vipra Mishra · Accepted Answer

Dear Student
Average speed =total distancetotal timeTotal time for journey =total distanceAverage speed  =8050 = 85 hrsTime for first 40 km, t1 =4040 = 1 HrSo time for remaining journey t2  = 85-1=35hrsSpeed of remaining journey =40 t2  =403/5  =2003 =66
66 km/hr
Regards