Speed is the measurement of distance covered per period of time as km/hr and m/sec. How many minutes are in:

$$120 \text{ minutes} + 30 \text{ minutes} = 150 \text{ minutes}$$

Jibu: $\boxed{\text{150 minutes}}$

b) $1\frac{1}{2}$ hours

$$60 \text{ minutes} + 30 \text{ minutes} = 90 \text{ minutes}$$

Jibu: $\boxed{\text{90 minutes}}$

c) $3\frac{1}{2}$ hours

$$180 \text{ minutes} + 30 \text{ minutes} = 210 \text{ minutes}$$

Jibu: $\boxed{\text{210 minutes}}$

d) $3\frac{3}{4}$ hours

$$180 \text{ minutes} + 45 \text{ minutes} = 225 \text{ minutes}$$

Jibu: $\boxed{\text{225 minutes}}$

2. Badilisha dakika zifuatazo kuwa masaa.
Tunajua kuwa dakika 60 ni sawa na saa 1. Ili kubadilisha dakika kuwa masaa, tunagawanya kwa 60.

a) 240 minutes

$$\frac{240 \text{ minutes}}{60 \text{ minutes/hour}} = 4 \text{ hours}$$

Jibu: $\boxed{\text{4 hours}}$

b) 120 minutes

$$\frac{120 \text{ minutes}}{60 \text{ minutes/hour}} = 2 \text{ hours}$$

Jibu: $\boxed{\text{2 hours}}$

c) 180 minutes

$$\frac{180 \text{ minutes}}{60 \text{ minutes/hour}} = 3 \text{ hours}$$

Jibu: $\boxed{\text{3 hours}}$

d) 270 minutes

$$\frac{27}{6} \text{ hours} = \frac{9}{2} \text{ hours} = 4\frac{1}{2} \text{ hours}$$

Jibu: $\boxed{4\frac{1}{2} \text{ hours}}$

3. Fanya hesabu zifuatazo (Kujumlisha masaa na dakika).

a) Hours mins: 4 50 + 3 30

$$4 \text{ hours} + 3 \text{ hours} + 1 \text{ hour (kutoka dakika)} = 8 \text{ hours}$$

Jibu: $\boxed{\text{8 hours 20 minutes}}$

b) Hours mins: 3 40 + 5 30

$$3 \text{ hours} + 5 \text{ hours} + 1 \text{ hour (kutoka dakika)} = 9 \text{ hours}$$

Jibu: $\boxed{\text{9 hours 10 minutes}}$

4. Toa zifuatazo (Kutoa masaa na dakika).

a) Hours mins: 5 20 - 2 40

Azima saa 1 (dakika 60) kutoka kwenye masaa.

$$5 \text{ hours} \rightarrow 4 \text{ hours}$$ $$20 \text{ mins} + 60 \text{ mins} = 80 \text{ mins}$$

$$4 \text{ hours} - 2 \text{ hours} = 2 \text{ hours}$$

Jibu: $\boxed{\text{2 hours 40 minutes}}$

b) Hours mins: 6 30 - 2 50

Azima saa 1 (dakika 60) kutoka kwenye masaa.

$$6 \text{ hours} \rightarrow 5 \text{ hours}$$ $$30 \text{ mins} + 60 \text{ mins} = 90 \text{ mins}$$

$$5 \text{ hours} - 2 \text{ hours} = 3 \text{ hours}$$

Jibu: $\boxed{\text{3 hours 40 minutes}}$

5. Fanya hesabu (Kujumlisha na kutoa wiki na siku).
Tunajua kuwa wiki 1 ina siku 7.

a) Weeks days: 4 4 + 5 5

$$4 \text{ weeks} + 5 \text{ weeks} + 1 \text{ week (kutoka siku)} = 10 \text{ weeks}$$

Jibu: $\boxed{\text{10 weeks 2 days}}$

b) Weeks days: 4 4 - 1 5

Azima wiki 1 (siku 7) kutoka kwenye wiki.

$$4 \text{ weeks} \rightarrow 3 \text{ weeks}$$ $$4 \text{ days} + 7 \text{ days} = 11 \text{ days}$$

$$3 \text{ weeks} - 1 \text{ week} = 2 \text{ weeks}$$

Jibu: $\boxed{\text{2 weeks 6 days}}$