a=input("1)Find speed\n2)Find distance\n3)Find time\n4)Quit\n")
 
while a!=4:
    if a==1:
        d=input("\nEnter distance: ")
        t=input("Enter time: ")
        print ("Speed: "+str(d/t)+"\n")
    elif a==2:
        s=input("\nEnter speed: ")
        t=input("Enter time: ")
        print ("Distance :"+str(s*t)+"\n")
    elif a==3:
        s=input("\nEnter Speed: ")
        d=input("Enter distance: ")
        print ("Time :"+str(d/s)+"\n")
    a=input("1)Find speed\n2)Find distance\n3)Find time\n4)Quit\n")

s=input("Speed: ")
d=input("Distance: ")
t=input("Time: ")
 
#Considering 1- is the symbol for 'find'
 
s=d/t
if(s==1-):
    print (s)
elif(d==1-):
    print (d)
elif(t==1-):
    print (t)

print("Enter zero for the value you are looking for:")
 
s = d = t = 0
 
while True:
 
    s = input("Speed (miles/hour): ")
    d = input("Distance (miles): ")
    t = input("Time (hours): ")
 
    if s == 0:
        s = d/float(t)
        f = "You have gone %.3f miles in %.3f hours, speed = %.3f"
        print f % (d, t, s)
    if d == 0:
        d = s * float(t)
        f = "You have gone at %.3f miles/h for %.3f hours, distance = %.3f"
        print f % (s, t, d)
    if t == 0:
        t = d/float(s)
        f = "You have gone %.3f miles at %.3f miles/h, time = %.3f"
        print f % (d, s, t)
 
    yn = raw_input( "Any more calculations (y or n)? ")
    if 'n' in yn.lower():
        break