Consider the times (in seconds) that it took children and adults to solve a Rubik’s cube at a competition. What does the circled section represent? One child took 72 seconds to solve the Rubik's cube, while another took 71 seconds to solve it. 21 children completed the Rubik's cube in 7 seconds. One child solved the Rubik's cube in 21.7 seconds. 21 children completed the Rubik's cube in 7 minutes.

If a speedcuber's times for four cubes were 6.3 seconds, 6.7 seconds, 6.5 seconds, and 6.9 seconds, what was their average time?

Two boys ‘A’ and ‘B’ are running on a circular track. ‘A’ takes 1 minute to finish one round while ‘B’ takes 50 seconds to complete one round. If they start simultaneously at 10.00 am, then which of the following is the time at which they can meet at the starting point?10.11 am10.15 am10.22 am10.33 am

Marco can build a laptop twice as fast as Cliff. Working together, it takes them 5 hours. How long would it have taken Marco working alone?Write your answer as a decimal.

X, Y, Z start at the same time in the same direction to run around a circular stadium. X completes a round in 63 seconds, Y in 105 seconds and Z in 210 seconds. If they start at the same time, then at what time will they meet again at the starting point?Options :A] 9 min 9 secondsB] 10 min 30 secondsC] 10 min 6 secondsD] 8 min 4 seconds

It takes thirty kids four hours to build a man-sized sand castle.How many kids were there if the same game took only two and a half hours?