In a certain race, A beats B by 35 seconds and B beats C by 45 seconds. The speed of B is the average of the speeds of A and C. What time (in minutes) does C take to run the race?

In a 1 km race, P, Q, and R are the three participants. P can give Q and R a head start of 240 m and 259 m, respectively. How much of a head start can Q allow R?

In a 200 m linear race, Amit beats Ankur by 40 m and Ankur beats Saroj by 20 m. If Amit and Saroj run a 600 m race, by what distance (in metres) will Amit beat Saroj?