map suspend rxjava

RxJava.kt

fun hiThere(): Single<Int> {
    return Completable.timer(1, TimeUnit.SECONDS)
        .andThen(Single.just(40))
        .subscribeOn(computation())
}
fun test() {
    Observable.just(1)
        .flatMapSingle { hiThere() }
        .subscribeOn(io())
        .subscribe { println(it) }
}