Please help me solve this problem. Thank you in advance.

Alex the geologist is in the desert, 10 km from a long, straight road and 45 km from base camp. The base camp is also 10 km from the road, on the same side of the road as Alex is. On the road, the jeep can do 50 km/h, but in the desert sands, it can only manage 30 km/h. Alex wants to return to base camp as quickly as possible. How long will the trip take?