# If A runs at 8 km/h, what is the speed of B?

A and B run a 1 km race. A gives B a start of 50 m and still beats him by 15 seconds. If A runs at 8 km/h, what is the speed of B?

(a) 4.4 km/h

(b) 5.4 km/h

(c) 6.4 km/h

(d) 7.4 km/h

(a) 4.4 km/h

(b) 5.4 km/h

(c) 6.4 km/h

(d) 7.4 km/h