one back and forth $$156\div3=52$$metres  length of the lane$$52\div2=26$$metres 
Pip swam $$3$$ back and forth in the lane for a total of $$156$$ metres, how long is the lane in this pool? 

1: $$52$$ 
2: $$104$$ 
3: $$26$$ 
4: $$234$$ 