let distance = 2000;

let speed = 280000;

// Code your orbitCircumference function here:

function orbitCircumference(distance){

let circumference = 2 * Math.PI * distance

return circumference

};

// Code your missionDuration function here:

function missionDuration(orbits,distance,speed){

let time = (orbitCircumference(distance) * orbits) / speed;

time = (Math.round(time * 100)) / 100;

return time

}

console.log(`The mission will travel ${orbitCircumference(distance)}km around the planet, and it will take ${missionDuration(6,distance,speed)} hours to compelte. `)

// Candidate data & crew array.

let candidateA = {

'name':'Gordon Shumway',

'species':'alf',

'mass':90,

'o2Used':function(hrs){return 0.035*hrs},

'astronautID':414

};

let candidateB = {

'name':'Lassie',

'species':'dog',

'mass':19.1,

'o2Used':function(hrs){return 0.030*hrs},

'astronautID':503

};

let candidateC = {

'name':'Jonsey',

'species':'cat',

'mass':3.6,

'o2Used':function(hrs){return 0.022*hrs},

'astronautID':796

};

let candidateD = {

'name':'Paddington',

'species':'bear',

'mass':31.8,

'o2Used':function(hrs){return 0.047*hrs},

'astronautID':291

};

let candidateE = {

'name':'Pete',

'species':'tortoise',

'mass':417,

'o2Used':function(hrs){return 0.010*hrs},

'astronautID':599

};

let candidateF = {

'name':'Hugs',

'species':'ball python',

'mass':2.3,

'o2Used':function(hrs){return 0.018*hrs},

'astronautID':890

};

let crew = [candidateA,candidateC,candidateE];

// Copy/paste your selectRandomEntry function here:

function selectRandomEntry(array){

return Math.floor(Math.random() * array.length);

}

// Code your oxygenExpended function here:

function oxygenExpended(Candidate){

let time = missionDuration(3,distance,speed);

console.log(time);

let o2Used = (Math.round(Candidate.o2Used * time *1000)) / 1000;

return console.log(`${Candidate.name} will perform a spacewalk, which will last ${time} hours and require ${o2Used}kg of oxygen`)

};

console.log(oxygenExpended(selectRandomEntry(crew)));