Async.kt

fun main() = runBlocking(Dispatchers.Default) { 

    val j = GlobalScope.launch {
        val m = measureTimeMillis {
            val answer1 = async { networkCall() }
            val answer2 = async { networkCall2() }
            println(answer1.await())
            println(answer2.await())
        }
        println("m: $m")
    }
    j.join()

}

suspend fun networkCall() : String {
    delay(3000L)
    return "Answer 01"
}

suspend fun networkCall2() : String {
    delay(3000L)
    return "Answer 02"
}

// prints 
// Answer 01
// Answer 02
// m: 3018

build.gradle

dependencies {
    testImplementation(kotlin("test"))
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.6.4")
}

Launch.kt

import kotlinx.coroutines.*
import kotlin.system.measureTimeMillis

fun main() = runBlocking(Dispatchers.Default) {

    val j = GlobalScope.launch {
        val m = measureTimeMillis {
        var ans1 = ""
        var ans2 = ""
        val answer1 = launch { ans1 = networkCall() }
        val answer2 = launch { ans2 = networkCall2() }
        answer1.join()
        answer2.join()
        println(ans1)
        println(ans2)
        }
        println("m: $m")
    }
    j.join()

}

suspend fun networkCall() : String {
    delay(3000L)
    return "Answer 01"
}

suspend fun networkCall2() : String {
    delay(3000L)
    return "Answer 02"
}

// prints 
// Answer 01
// Answer 02
// m: 3019