Assistance needed

[JayJay007]

I need help on how to go about this. Any tips? I'd appreciated. Thanks!

Problem:

http://tinypic.com/r/hvzdd1/8

[anup30]

do
{
/*get the user input*/

} while(/*input is wrong*/);

double result = /* multiply, velocity in the selected medium(meter/sec), with, user inputed time(sec) */

[JayJay007]

Thanks! I will try this and post the program once I'm done.