Yes Lorena... "Tez" is perfect... you could also use "Jaldi" (pronounced jull-dee) which sort of means Hurry.. you know...
Gaadi tez chalao (Vehicle fast drive ---> Drive faster)
Mein Jaldi mein hoon ( I hurry in am ---> Im in a hurry)
and Opposite of Tez/Jaldi is "Dheeray".
You can post all the lines in English that you think you'd need while travelling .. I ll translate them for you , no problem. Have fun travelling (which parts you planning to visit?)