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A : 3 hours -> 1 kitchen

A : 1 hour -> 1/3 kitchen

B : 4 hours -> 1 kitchen

B : 1 hour -> 1/4 kitchen

C : 6 hours -> 1 kitchen

C : 1 hour -> 1/6 kitchen

A + B : 1/3 + 1/4 = 7/12  kitchen per hour

From 0845 to 1015 (1.5 hour), A+B completed 1.5 × 7/12 = 7/ of the kitchen

A+C : 1/3 + 1/6 = 1/2 kitchen per hour

To complete the remaining 1/ of the kitchen, A+C  would need

1/÷ 1/2 = 1/4 hour = 15 mins

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In 1 h,
Andrew ——- 1/3
Benny ——- 1/4
Charles ——- 1/6

0845 to 1015 ——- 1.5 h = 3/2 h
1/3 + 1/4 = 7/12
(7/12) x (3/2) = 7/8 (completed by Andrew and Benny)
(1/3) + (1/6) = 1/2 ——- 1h
1 – 7/8 = 1/8 ——- 1/4 h

Ans : 1/4 h.

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