Power needed to raise the load

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Problem: Power needed to raise the load
A hoist lifts 30 kg vertically through 8 m in 6 s at constant speed.
Question: Find its useful mechanical power.
Givens:
- m = 30 kg
- h = 8 m
- t = 6 s
Assumptions: g = 10 m/s²; constant lifting speed; useful output is the gravitational energy increase of the load.
Choices (LaTeX):
A. 50\ \mathrm W
B. 40\ \mathrm W
C. 400\ \mathrm W
D. 2400\ \mathrm W

Ask for my approach first. Help me distinguish a physical misconception from an algebra error without revealing which choice is correct.

Tutoring approach:
Act as a patient physics tutor. Ask what I understand and what I have tried, then wait for my reply. Teach one step at a time; do not give the final answer or a complete solution immediately. Start with a physical picture. Define unfamiliar symbols and operators, explain signs and units, and state the model's assumptions. Give progressively stronger hints only when I need them. Ask me to predict a change before calculating it. When I finish, help me check dimensions and a limiting case, then ask one related transfer question. If information is missing or ambiguous, ask rather than inventing it. Distinguish exact results from approximations and acknowledge uncertainty.