C and D take part in 200 m race. C runs at 10 kmph. C gives D a start of 16 m and still beats him by 16 seconds. The speed of D is:

7.53 kmph

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4.25 kmph

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4.14 kmph

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5.24 kmph

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Solution

The correct option is A
7.53 kmph

C's speed = $(10 \times \frac{5}{18}) = \frac{25}{9} m / s e c$

Time taken by C to cover 200 m = $(200 \times \frac{9}{25})$ = 72 sec.

Time taken by D to cover 184 m = (72 + 16) = 88 sec.

D's speed = $(\frac{184}{88} \times \frac{18}{5})$ = 7.53 kmph

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C and D take part in 200 m race. C runs at 10 kmph. C gives D a start of 16 m and still beats him by 16 seconds. The speed of D is:

The correct option is A 7.53 kmph C's speed = (10×518)=259m/sec Time taken by C to cover 200 m = (200×925) = 72 sec. Time taken by D to cover 184 m = (72 + 16) = 88 sec. D's speed = (18488×185) = 7.53 kmph

The correct option is A
7.53 kmph

C's speed = $(10 \times \frac{5}{18}) = \frac{25}{9} m / s e c$

Time taken by C to cover 200 m = $(200 \times \frac{9}{25})$ = 72 sec.

Time taken by D to cover 184 m = (72 + 16) = 88 sec.

D's speed = $(\frac{184}{88} \times \frac{18}{5})$ = 7.53 kmph