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a) you shouldn't be doing slow cardio for an hour and a half if you're trying to lose weight. You'd be better off keeping your running to around 25-30 min.* and upping the intensity. LSD runs (long slow distance, guys :-D) build endurance for sports but can and will cause catabolism, and you can lose your hard-earned muscle.
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Actually, I prefer low intensity long duration myself and am having very good success with it. You guys need to stop worrying about losing muscle mass with this or that.. Just like lifting weights, if you have good preworkout nutrition, or what I prefer a good 40 gram BCAA drink, then you're fine. If anything, running for 30-40 minutes is a lot worse for losing mass.. Not to mention the fact that if you're squatting/deadlifting heavy, you're knees are already getting pounded.. Now try running on those joints for a half hour.
For me, there's two choices. Either starting slow and building myself up to a MAX of 20 minutes HIIT on something like the recumbant bike of elliptical machine, or 45-60 minutes of low intensity cardio to start the day off. Doing low intensity cardio enables you to continue training hard and heavy in the gym w/out burning yourself out with running. Now, does walking burn the same amount of cals running? Obviously not.. But what you are trying to accomplish isn't burning x amount of cals w/in a time frame vs. trying to increase your metabolism for the rest of the day.
Now, would I recommend an hour and a half walking, probably not.. Usually a max of 60 minutes for myself, with 45 minutes about right. The key for the heavies is LOW IMPACT as per machines or walking.