According to the excerpt, how does Karl Schwarzschild use Einstein’s ideas to draw a conclusion?

There is nothing in the world which travels faster than these persian couriers . . it is said that men and horses are stationed along the road, equal in number to the number of days the journey takes - a man and a horse for each day. . neither snow nor rain nor heat nor gloom of night stays these couriers from the swift completion of their appointed rounds. read this passage and highlight text that gives evidence as to why persian couriers are able to complete their jobs so quickly. according to evidence in the passage, why are persian couriers able to travel so quickly? check all that apply. men and horses are stationed along the road. they rest every night so they can go at top speed the following day. couriers do not allow bad weather to slow them down. they receive a reward upon the completion of their journey.