travelling at a rate of 10km/h, a cyclist took 30 minutes for a journey. at what rate should he cycle if he wishes to complete the journey in 20 minutes.

Question

I want to find the rate he must travel to complete the journey in 20 mins.

Answer 1

The distance of travel is d = (10 km/hr)(1/2 hour) = 5 km.

 

 

He then has to travel 5 km in 20 min or 1/3 hour.

 

 

So the necessary speed is v = 5 km / (1/3 hour) = 15 km/hr