Thank you Ender & Kangkangteo!

A bullet train left for Country Zoro at 0700. The train stopped over at Country Starz for half an hour before continuing its journey to Country Zoro. It reached Country Zoro at 1345. If the average speed of the train was 350 km/h, what was the total distance covered by the train?

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It takes Mr Lim 20 minutes to saw a pole into 5 equal pieces. How many minutes would it take him to saw another similar pole into 10 equal pieces?

Thank you alfretztay & numeric!

At 12 noon, a car left Town A for Town B at an average speed of 100 km/h while a bus left Town B for Town A at an average speed of 80 km/h. At 4.30 p.m, the two vehicles were 20 km apart. Find the distance between Town A and Town B.

Tom and Jerry take 1 hour to clean the fish tank together. If Tom take 3 hours to clean the tank on his own, how long will it Jerry to clean the tank alone?

Mark and Jie Ming started walking from the same spot in the opposite directions along a straight path. They walked for 30 minutes. At the end of the walk, they were 5 km apart. Mark’s average speed was 4 km/h. What was Jie Ming’s average speed?

alfretztay:

Kangkangteo:

[quote=\"leo_mums\"]http://i58.tinypic.com/25rouuq.jpg\">

Area of each square frame = 24x24 - 18x18
= 252

24 - 18 = 6
6/2 = 3

Area of each shaded square = 3x3 = 9

Top and bottom left frames -(2) -> 2 shaded squares each

252 - 9x2 = 234

Top and bottom middle and right and centre right frames (5)--> 4 shaded squares each

252 - 9x4 = 216

Centre left and middle frames (2) --> 8 shaded squares each

252 - 9x8 = 180

234x2 + 216x5 + 180x2 = 1908

Area of frame without the overlapping is 1908 sq cm.

I would solve the above problem as follows :
24 x 24 – 18 x 18 = 252
252 x 9 = 2268
24 – 18 = 6
6/2 = 3
3 x 3 = 9
9 x 20 x 2 = 360
2268 – 360 = 1908

Ans : 1908 sq cm.[/quote] :thankyou: alfretztay & Kangkangteo :salute: :salute: :salute:

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