ഒരു നിശ്ചിത ദൂരം പിന്നിടാൻ എടുക്കുന്ന സമയം 20 % കുറക്കാൻ ഒരു ഓട്ടക്കാരൻ തന്റെ വേഗത എത്ര ശതമാനം വർധിപ്പിക്കണം ?
A25
B20
C15
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