Question
A was travelling from point X to point Y. He increased
his speed by 20 km/h after every hour. He reached his destination in 14 hours. If his initial speed was 60 km/h, then what was his average speed in the whole journey?Solution
Total distance travelled by A = (14/2) × {2 × 60 + (14 – 1) × 20} = 10 × (120 + 260) = 2660 km Required average speed = 2660/14 = 190 km/h
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...What will come in place of the question mark (?) in the following series?
77, 198, 342, 511, 707, ?
117, 117, 121, 129, 141, ?
What will come in place of the question mark (?) in the following series?
120, 130, ?, 140, 100, 150
70, 95, 145, ?, 320, 445
16, 9, ?, 114.25, 750.625, 6396.3125
Find the next term in the series:
4, 9, 19, 39, 79, ?
The question below is based on the given series I. The series I satisfy a certain pattern, follow the same pattern in series II and answer the questions...
74, 84, 64, 104, ?, 184
What will come in place of the question mark (?) in the following series?
24, 8, 15, ?, 12, 4
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