Find the difference in longitude.

Since both longitudes are in the same hemisphere (East), subtract them.

$$\text{Difference in longitude} = 22^\circ \text{ E} - 10^\circ \text{ E} = 12^\circ$$

We know that $1^\circ$ of longitude corresponds to 4 minutes of time.

$$\text{Time difference} = 12^\circ \times 4 \text{ minutes/degree} = 48 \text{ minutes}$$

The difference in time is $\boxed{\text{48 minutes}}$.

68. Find the difference on $30^\circ$ W and $8^\circ$ E

Since the longitudes are in different hemispheres (West and East), add their absolute values.

$$\text{Difference in longitude} = 30^\circ \text{ W} + 8^\circ \text{ E} = 38^\circ$$

$$152 \text{ minutes} = \frac{152}{60} \text{ hours} = 2 \text{ hours and } 32 \text{ minutes}$$

The difference in time is $\boxed{\text{2 hours and 32 minutes}}$.

69. What is the local time of Antananarivo at $47^\circ$ E longitude when the time in Kigali at $30^\circ$ E longitude is 7:00 am.

Both longitudes are in the East, so subtract them.

$$\text{Difference in longitude} = 47^\circ \text{ E} - 30^\circ \text{ E} = 17^\circ$$

Antananarivo ($47^\circ$ E) is to the East of Kigali ($30^\circ$ E), so its time will be ahead.

$$\text{Local time at Antananarivo} = 7:00 \text{ am} + 1 \text{ hour } 8 \text{ minutes} = 8:08 \text{ am}$$

The local time in Antananarivo is $\boxed{\text{8:08 am}}$.

70. Determine the local time at A $14^\circ$ E longitude when the time at B $48^\circ$ W longitude is 11:56 pm.

Since the longitudes are in different hemispheres (East and West), add their absolute values.

$$\text{Difference in longitude} = 14^\circ \text{ E} + 48^\circ \text{ W} = 62^\circ$$

Location A ($14^\circ$ E) is to the East of location B ($48^\circ$ W), so its time will be ahead.

$$\text{Local time at A} = 11:56 \text{ pm} + 4 \text{ hours } 8 \text{ minutes}$$

Adding 4 minutes to 11:56 pm makes it 12:00 am (midnight) of the next day.
Then add the remaining 4 hours and 4 minutes:

$$12:00 \text{ am} + 4 \text{ hours } 4 \text{ minutes} = 4:04 \text{ am (next day)}$$

The local time at A is $\boxed{\text{4:04 am}}$.

71. Identify the difference in time in $7^\circ$ E and $5^\circ$ W.

Since the longitudes are in different hemispheres (East and West), add their absolute values.

$$\text{Difference in longitude} = 7^\circ \text{ E} + 5^\circ \text{ W} = 12^\circ$$

$$\text{Time difference} = 12^\circ \times 4 \text{ minutes/degree} = 48 \text{ minutes}$$

The difference in time is $\boxed{\text{48 minutes}}$.