设:从小华家到姥姥家上坡路a和下坡路b.姥姥家离小华家a+b.
a/9 + b/15 =22/60
b/9 + a/15 =26/60
a = 3
b = 1/2
从小华家到姥姥家上坡路3 km 和下坡路1/2 km
姥姥家离小华家 3.5 km