Question

a car has to travel 90 kilometre distance travelled the first 30 km at an average speed of 30 km per hour by what speed it should travel the next 50 km distance so that its average speed should be 60 km per hour with full solution​

Answer 1

Mark as brainliest please.

Explanation =

Speed = distance / time
For first 30 km - speed = 30, distance = 30km,
Time = distance / speed = 1 hour

For whole journey - distance = 90km, speed = 60km/hr,
Time = distance / speed = 90/60 = 1.5 hr

For remaining distance - distance = 90-30 = 60km, time = 1.5 - 1 = 0.5 hr
Speed = 60/0.5 = 120 km/hr