Step 1: Read the distances on the map:
The map shows two routes from London to Mumbai.
The route through the Mediterranean and Red Sea (the Suez Canal route) is 7,200 miles.
The route around Africa is 12,300 miles.
The difference is 12,300 - 7,200 = 5,100 miles.
Step 2: Point 1: a direct and shorter trade route:
The canal gave ships between Britain and India a direct and shorter path.
They no longer had to sail around Africa, so about 5,100 miles of travel was saved.
Less distance also meant less time at sea and less cost on every voyage.
Step 3: Point 2: stronger British control over trade:
Lower transport costs made it cheaper for Britain to buy raw materials from India and to sell goods here.
The easier access to the Indian market tightened British control over the foreign trade of India.
Final Answer:
Artificial waterways such as the Suez Canal gave a direct route that cut about 5,100 miles, lowered transport cost and made the Indian market easier to reach, so British control over the foreign trade of India grew.