Does a rhino eat a tiger?

No, the Rhinoceros is a herbivore and eats grasses, leaves and fruit. They eat allot too, but they don't eat Tigers, or other animals. Also water is very important to them, both to drink and to swim, and to wallow in. Mud helps them stay cool, and protect their skin from biting insects, they even allow the Egrets and Tickbirds to perch on them and pick them clean. For more details, please sites listed below.

it might be able to, but is hugely unlikely to try.

Rhinos are herbivores, plant eaters, and wouldn't eat a tiger.