Page 47 - NUMINO Challenge_D2

Type 5-1 Least Length of Time Needed

Six people from village A want to go to a party held in village B. They
will travel in a car that can carry up to two people. The six people, A,
B, C, D, E, and F, each take 1, 2, 7, 11, 14, and 21 minutes to village
B. The traveling time is calculated using the method shown in the box
below. What is the shortest length of time for all six people to travel to
village B?

It takes 1 minute for A to travel to village B.
C takes 7 minutes to travel. When A and C travel
together, it takes 7 minutes.

1 Since one person needs to come back, the two people who take the
shortest length of time to travel should go to village B first. Which two
people should travel first?

2 In order to spend the shortest length of time traveling, A and B, who
travel the fastest, should go alone. Fill in the .

Village A Village B

A, B (2 minutes)

A (21 minutes)

E, F (21 minutes)
( minute(s))

A, B ( minutes)

A (1 minute)
(11 minutes)
( minute(s))

A, B (2 minutes)

3 What is the shortest length of time it takes for all 6 people to travel to
village B?

44 NUMINO Challenge D2