Using Math step with Where clause

[dghanwat]

How can I use math step with where clause for eg. the below condition works well when I try from gremlin console
where(math("(a1 - d1)").by("seconds").by("seconds").is(lte(1500)))

But the same condition does not compile in Scala code.

.where(math("(a1 - d1)").by("arrivalSeconds").by("departureSeconds").is(P.lte(1500)))